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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
75
GRADE
C
FIX
4
REVIEW
3
PASS
8
INFO
2

Performance-focused optimization plan with CWV assessment, top offenders, and time estimates

Mobile Desktop
65
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
100
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
100
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
100
SEO Measures basic SEO optimizations: meta tags, crawlability, link text, and mobile friendliness.

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

2.87 s

Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.

10.85 s

Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.

144 ms

Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.

0.000

Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.

4.97 s

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

14.49 s

Page Load Progression

375 ms
750 ms
1.1 s
1.5 s
1.9 s
2.2 s
2.6 s
3.0 s
Checks
17
8 PASS 3 REVIEW 4 FIX
F
Page Weight Budget
Action
5.8 MB transferred, 167 requests
FIX
5.8 MB transferred, 167 requests
Critical::
Page weighs 9.6 MB (5.8 MB transferred)
Warning::
Images are 3.1 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 3.1 MB
Info::
Fonts are 2.1 MB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 2.1 MB
Warning::
JavaScript is 519 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 519 KB
Warning::
167 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 1.2 g CO2 per page load
5.8 MB / 2.4 MB budget
5.8 MB transferred
167 requests
1.2 g CO2 per page load
Images 3.1 MiB 53%
Fonts 2.1 MiB 36%
JavaScript 518.9 KiB 9%
CSS 114.3 KiB 2%
HTML 24.4 KiB 0%
Other 3.9 KiB 0%
Other 558 B 0%
Other 549 B 0%
0 2.4 MB 4.9 MB
Over budget

Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.

Why this matters

Image bandwidth is high — modern formats (WebP/AVIF) and resizing typically cut it 50%+.

Source: web.dev

Subset fonts to include only used characters, or switch to system font stacks.

Why this matters

Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).

Source: web.dev font loading

Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.

Why this matters

JavaScript bundle is large — code-split routes and lazy-load off-screen components to defer.

Source: web.dev

Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.

Why this matters

High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.

Source: web.dev

D
Third-Party Impact
Action
83% third-party, 0 ms blocking
FIX
83% third-party, 0 ms blocking
Warning::
Third-party code accounts for 83% of page weight (4.9 MiB of 5.8 MiB)
Info::
Third-party blocking time is low (0 ms)
17%
83%
First-party Third-party
F
JS Execution Cost
Action
4664ms total JS execution
FIX
4664ms total JS execution
Warning::
https://www.keio.ac.jp/ja/: 2215ms CPU time
Warning::
https://www.keio.ac.jp/_astro/client.B9bUpm8d.js: 1137ms CPU time
Warning::
Unattributable: 627ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=G-BYN8...: 260ms CPU time
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-N74...: 251ms CPU time
Info::
Third-party scripts: 1137ms (24% of total)

Main Thread Breakdown

Style & Layout 40% Script Evaluation 27% Other 21% Rendering 6%
ScriptTotalScriptingParse/CompileParty
https://www.keio.ac.jp/ja/2215ms30ms4ms1st
https://www.keio.ac.jp/_astro/client.B9bUpm8d.js1137ms870ms1ms1st
Unattributable627ms27ms0ms3rd
https://www.googletagmanager.com/gtag/js?id=G-BYN8CM9PTN&cx=c&gtm=4e64h1260ms218ms37ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-N74PD224251ms158ms55ms3rd
https://www.keio.ac.jp/_astro/useCarousel.DaFIBTLQ.js119ms4ms0ms1st
https://www.keio.ac.jp/_astro/index.astro_astro_type_script_index_0_lang.u9MbvrJb.js57ms3ms0ms1st
D
Page Weight Inventory
Action
167 resources · 5.8 MB · 146 KB savings available
FIX
167 resources · 5.8 MB · 146 KB savings available
Warning::
Page weight 4.8 MB over 1MB target
Got: 5.8 MB Expected: ≤ 1 MB
Info::
~146 KB of savings available
Warning::
64 third-party resources (83% of weight)
Info::
8 resources over 200KB
167 resources · 5.8 MiB · 64 third-party 4.8 MiB over 1MB target
Image 53% · 3.1 MiB
Font 36% · 2.1 MiB
JavaScript 9% · 518.9 KiB
CSS 2% · 114.3 KiB
Document 0% · 24.4 KiB
Other 0% · 1.6 KiB

~146.4 KiB of savings available

Remove unused JavaScript: 146.4 KiB
B
JS Bundles
85 scripts, 146 KB unused
REVIEW
85 scripts, 146 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-BYN8...: 65 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-N74...: 61 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.keio.ac.jp/_astro/client.B9bUpm8d.js: 21 KB unused (38%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 146 KB
146 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-BYN8CM9PTN&cx=c&gtm=4e64h1157 KB65 KB (41%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-N74PD224125 KB61 KB (49%)✓3rd
https://www.keio.ac.jp/_astro/client.B9bUpm8d.js55 KB21 KB (38%)✓1st
https://recommend.www-prd.keio.ac.jp/js.recommend/tlab_v4.js4 KB—✓3rd
https://www.keio.ac.jp/_astro/index.astro_astro_type_script_index_0_lang.C8-l46be.js1 KB—✓1st
https://www.keio.ac.jp/_astro/index.astro_astro_type_script_index_0_lang.u9MbvrJb.js1 KB—✓1st
https://www.keio.ac.jp/_astro/index.astro_astro_type_script_index_0_lang.CxlcUlr_.js1 KB—✓1st
https://www.keio.ac.jp/_astro/index.astro_astro_type_script_index_0_lang.CT5tfAV9.js1 KB—✓1st
https://www.keio.ac.jp/_astro/index.astro_astro_type_script_index_0_lang.DAN8Lx6U.js1 KB—✓1st
https://www.keio.ac.jp/_astro/index.astro_astro_type_script_index_0_lang.D_uX7pEa.js1 KB—✓1st

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

B
HTTP Caching
public, max-age=0, s-maxage=60, stale-while-revalidate=86400, stale-if-error=86400
REVIEW
public, max-age=0, s-maxage=60, stale-while-revalidate=86400, stale-if-error=86400
Info::
Cache-Control header is set
Got: public, max-age=0, s-maxage=60, stale-while-revalidate=86400, stale-if-error=86400
Info::
CDN TTL: 1 minute (s-maxage=60)
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

public, max-age=0, s-maxage=60, stale-while-revalidate=86400, stale-if-error=86400

DirectiveValueMeaning
public—Any cache may store this response
max-age0Cache for 0 seconds
s-maxage60CDN caches for 1 minute
stale-while-revalidate86400Serve stale for 1 day while fetching fresh
stale-if-error86400
A+
Text Compression
All text resources are compressed
PASS
All text resources are compressed
Info::
All text resources are compressed
All text resources are properly compressed.
A
Image Optimization
21 images, 0 KB saveable
PASS
21 images, 0 KB saveable
Info::
All images are well-optimized
21 images 3.1 MB
0 oversized -0 KB
3 legacy format
0 missing dimensions CLS risk
A+
Font Loading
37 fonts (2131 KB)
PASS
37 fonts (2131 KB)
Info::
37 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

37

2131 KB total

Render-blocking

0

of 37

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s FCP 2.9 s LCP 10.8 shttps://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/72s5ldmoou.woff272s5ldmoou.woff2 https://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/72s5ldmoou.woff2 — 15.6 KiB — 71 ms — font-display: swaphttps://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/hergqzq8z8.woff2hergqzq8z8.woff2 https://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/hergqzq8z8.woff2 — 58.7 KiB — 140 ms — font-display: swaphttps://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/htkr59s6xs.woff2htkr59s6xs.woff2 https://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/htkr59s6xs.woff2 — 405.3 KiB — 150 ms — font-display: swaphttps://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/zv3ssux4mv.woff2zv3ssux4mv.woff2 https://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/zv3ssux4mv.woff2 — 16.0 KiB — 67 ms — font-display: swaphttps://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/urqt349uv1.woff2urqt349uv1.woff2 https://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/urqt349uv1.woff2 — 61.1 KiB — 147 ms — font-display: swaphttps://www.keio.ac.jp/_astro/inter-latin-400-normal.C38fXH4l.woff2inter-latin-400-normal.... https://www.keio.ac.jp/_astro/inter-latin-400-normal.C38fXH4l.woff2 — 23.5 KiB — 13 ms — font-display: swaphttps://www.keio.ac.jp/_astro/inter-latin-300-normal.BVlfKGgI.woff2inter-latin-300-normal.... https://www.keio.ac.jp/_astro/inter-latin-300-normal.BVlfKGgI.woff2 — 23.8 KiB — 17 ms — font-display: swaphttps://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/y1vsis8ipz.woff2y1vsis8ipz.woff2 https://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/y1vsis8ipz.woff2 — 66.1 KiB — 137 ms — font-display: swaphttps://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/4ewohjpu58.woff24ewohjpu58.woff2 https://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/4ewohjpu58.woff2 — 60.9 KiB — 119 ms — font-display: swaphttps://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/jodn3efki1.woff2jodn3efki1.woff2 https://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/jodn3efki1.woff2 — 54.7 KiB — 132 ms — font-display: swaphttps://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/b18ve9n44r.woff2b18ve9n44r.woff2 https://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/b18ve9n44r.woff2 — 30.1 KiB — 105 ms — font-display: swaphttps://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/e3ypsixjco.woff2e3ypsixjco.woff2 https://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/e3ypsixjco.woff2 — 44.2 KiB — 81 ms — font-display: swaphttps://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/69xkdy8e30.woff269xkdy8e30.woff2 https://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/69xkdy8e30.woff2 — 64.8 KiB — 127 ms — font-display: swaphttps://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/18odm8801s.woff218odm8801s.woff2 https://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/18odm8801s.woff2 — 59.3 KiB — 127 ms — font-display: swaphttps://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/5fw3eaa0kr.woff25fw3eaa0kr.woff2 https://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/5fw3eaa0kr.woff2 — 52.2 KiB — 122 ms — font-display: swaphttps://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/n8huxpn8gs.woff2n8huxpn8gs.woff2 https://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/n8huxpn8gs.woff2 — 17.7 KiB — 107 ms — font-display: swaphttps://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/dgggdzviqw.woff2dgggdzviqw.woff2 https://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/dgggdzviqw.woff2 — 30.1 KiB — 107 ms — font-display: swaphttps://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/j5y8sbu30n.woff2j5y8sbu30n.woff2 https://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/j5y8sbu30n.woff2 — 42.7 KiB — 113 ms — font-display: swaphttps://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/5isqrwjuls.woff25isqrwjuls.woff2 https://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/5isqrwjuls.woff2 — 56.7 KiB — 103 ms — font-display: swaphttps://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/z5jvnuuivw.woff2z5jvnuuivw.woff2 https://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/z5jvnuuivw.woff2 — 58.6 KiB — 112 ms — font-display: swaphttps://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/hkqbhh9dqa.woff2hkqbhh9dqa.woff2 https://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/hkqbhh9dqa.woff2 — 17.7 KiB — 102 ms — font-display: swaphttps://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/oms3judamg.woff2oms3judamg.woff2 https://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/oms3judamg.woff2 — 61.0 KiB — 246 ms — font-display: swaphttps://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/u2aed8jm4l.woff2u2aed8jm4l.woff2 https://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/u2aed8jm4l.woff2 — 61.9 KiB — 155 ms — font-display: swaphttps://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/mp6g3niysf.woff2mp6g3niysf.woff2 https://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/mp6g3niysf.woff2 — 59.0 KiB — 157 ms — font-display: swaphttps://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/sifycqxr4i.woff2sifycqxr4i.woff2 https://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/sifycqxr4i.woff2 — 56.0 KiB — 154 ms — font-display: swaphttps://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/esdohbnprp.woff2esdohbnprp.woff2 https://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/esdohbnprp.woff2 — 54.7 KiB — 150 ms — font-display: swaphttps://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/9oma19ipye.woff29oma19ipye.woff2 https://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/9oma19ipye.woff2 — 11.3 KiB — 149 ms — font-display: swaphttps://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/5kp3nrkdf7.woff25kp3nrkdf7.woff2 https://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/5kp3nrkdf7.woff2 — 59.4 KiB — 146 ms — font-display: swaphttps://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/2pzpj5x0xi.woff22pzpj5x0xi.woff2 https://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/2pzpj5x0xi.woff2 — 62.6 KiB — 146 ms — font-display: swaphttps://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/y47019ey7k.woff2y47019ey7k.woff2 https://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/y47019ey7k.woff2 — 66.1 KiB — 147 ms — font-display: swaphttps://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/grxxxu0o2c.woff2grxxxu0o2c.woff2 https://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/grxxxu0o2c.woff2 — 66.3 KiB — 156 ms — font-display: swaphttps://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/m21olgdchu.woff2m21olgdchu.woff2 https://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/m21olgdchu.woff2 — 13.7 KiB — 149 ms — font-display: swaphttps://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/yfp5udr2dp.woff2yfp5udr2dp.woff2 https://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/yfp5udr2dp.woff2 — 61.5 KiB — 141 ms — font-display: swaphttps://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/qgqm6qjoxt.woff2qgqm6qjoxt.woff2 https://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/qgqm6qjoxt.woff2 — 28.3 KiB — 229 ms — font-display: swaphttps://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/v9kl0tu6b2.woff2v9kl0tu6b2.woff2 https://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/v9kl0tu6b2.woff2 — 64.1 KiB — 33 ms — font-display: swaphttps://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/eownsqw3jl.woff2eownsqw3jl.woff2 https://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/eownsqw3jl.woff2 — 74.7 KiB — 37 ms — font-display: swaphttps://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/vndslunts2.woff2vndslunts2.woff2 https://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/vndslunts2.woff2 — 71.0 KiB — 191 ms — font-display: swap
72s5ldmoou.woff2 woff2 swap
Size 16 KB
Load time 71 ms
Start 957 ms
Risk FOUT — text flashes from fallback to web font
hergqzq8z8.woff2 woff2 swap
Size 59 KB
Load time 140 ms
Start 962 ms
Risk FOUT — text flashes from fallback to web font
htkr59s6xs.woff2 woff2 swap
Size 405 KB
Load time 150 ms
Start 962 ms
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
zv3ssux4mv.woff2 woff2 swap
Size 16 KB
Load time 67 ms
Start 962 ms
Risk FOUT — text flashes from fallback to web font
urqt349uv1.woff2 woff2 swap
Size 61 KB
Load time 147 ms
Start 963 ms
Risk FOUT — text flashes from fallback to web font
inter-latin-400-normal.... woff2 swap
Size 24 KB
Load time 13 ms
Start 963 ms
Risk FOUT — text flashes from fallback to web font
inter-latin-300-normal.... woff2 swap
Size 24 KB
Load time 17 ms
Start 964 ms
Risk FOUT — text flashes from fallback to web font
y1vsis8ipz.woff2 woff2 swap
Size 66 KB
Load time 137 ms
Start 964 ms
Risk FOUT — text flashes from fallback to web font
4ewohjpu58.woff2 woff2 swap
Size 61 KB
Load time 119 ms
Start 964 ms
Risk FOUT — text flashes from fallback to web font
jodn3efki1.woff2 woff2 swap
Size 55 KB
Load time 132 ms
Start 964 ms
Risk FOUT — text flashes from fallback to web font
b18ve9n44r.woff2 woff2 swap
Size 30 KB
Load time 105 ms
Start 965 ms
Risk FOUT — text flashes from fallback to web font
e3ypsixjco.woff2 woff2 swap
Size 44 KB
Load time 81 ms
Start 965 ms
Risk FOUT — text flashes from fallback to web font
69xkdy8e30.woff2 woff2 swap
Size 65 KB
Load time 127 ms
Start 966 ms
Risk FOUT — text flashes from fallback to web font
18odm8801s.woff2 woff2 swap
Size 59 KB
Load time 127 ms
Start 966 ms
Risk FOUT — text flashes from fallback to web font
5fw3eaa0kr.woff2 woff2 swap
Size 52 KB
Load time 122 ms
Start 966 ms
Risk FOUT — text flashes from fallback to web font
n8huxpn8gs.woff2 woff2 swap
Size 18 KB
Load time 107 ms
Start 966 ms
Risk FOUT — text flashes from fallback to web font
dgggdzviqw.woff2 woff2 swap
Size 30 KB
Load time 107 ms
Start 967 ms
Risk FOUT — text flashes from fallback to web font
j5y8sbu30n.woff2 woff2 swap
Size 43 KB
Load time 113 ms
Start 967 ms
Risk FOUT — text flashes from fallback to web font
5isqrwjuls.woff2 woff2 swap
Size 57 KB
Load time 103 ms
Start 967 ms
Risk FOUT — text flashes from fallback to web font
z5jvnuuivw.woff2 woff2 swap
Size 59 KB
Load time 112 ms
Start 968 ms
Risk FOUT — text flashes from fallback to web font
hkqbhh9dqa.woff2 woff2 swap
Size 18 KB
Load time 102 ms
Start 968 ms
Risk FOUT — text flashes from fallback to web font
oms3judamg.woff2 woff2 swap
Size 61 KB
Load time 246 ms
Start 968 ms
Risk FOUT — text flashes from fallback to web font
u2aed8jm4l.woff2 woff2 swap
Size 62 KB
Load time 155 ms
Start 968 ms
Risk FOUT — text flashes from fallback to web font
mp6g3niysf.woff2 woff2 swap
Size 59 KB
Load time 157 ms
Start 969 ms
Risk FOUT — text flashes from fallback to web font
sifycqxr4i.woff2 woff2 swap
Size 56 KB
Load time 154 ms
Start 969 ms
Risk FOUT — text flashes from fallback to web font
esdohbnprp.woff2 woff2 swap
Size 55 KB
Load time 150 ms
Start 969 ms
Risk FOUT — text flashes from fallback to web font
9oma19ipye.woff2 woff2 swap
Size 11 KB
Load time 149 ms
Start 970 ms
Risk FOUT — text flashes from fallback to web font
5kp3nrkdf7.woff2 woff2 swap
Size 59 KB
Load time 146 ms
Start 970 ms
Risk FOUT — text flashes from fallback to web font
2pzpj5x0xi.woff2 woff2 swap
Size 63 KB
Load time 146 ms
Start 970 ms
Risk FOUT — text flashes from fallback to web font
y47019ey7k.woff2 woff2 swap
Size 66 KB
Load time 147 ms
Start 970 ms
Risk FOUT — text flashes from fallback to web font
grxxxu0o2c.woff2 woff2 swap
Size 66 KB
Load time 156 ms
Start 971 ms
Risk FOUT — text flashes from fallback to web font
m21olgdchu.woff2 woff2 swap
Size 14 KB
Load time 149 ms
Start 971 ms
Risk FOUT — text flashes from fallback to web font
yfp5udr2dp.woff2 woff2 swap
Size 61 KB
Load time 141 ms
Start 971 ms
Risk FOUT — text flashes from fallback to web font
qgqm6qjoxt.woff2 woff2 swap
Size 28 KB
Load time 229 ms
Start 971 ms
Risk FOUT — text flashes from fallback to web font
v9kl0tu6b2.woff2 woff2 swap
Size 64 KB
Load time 33 ms
Start 1.1 s
Risk FOUT — text flashes from fallback to web font
eownsqw3jl.woff2 woff2 swap
Size 75 KB
Load time 37 ms
Start 1.1 s
Risk FOUT — text flashes from fallback to web font
vndslunts2.woff2 woff2 swap
Size 71 KB
Load time 191 ms
Start 1.1 s
Risk FOUT — text flashes from fallback to web font
Optimization checklist
  • Preload critical fonts (priority=high)
  • Use woff2 format for all fonts
  • Set font-display to swap, optional, or fallback
  • Subset large fonts (≤100 KB each)

Fixing the unchecked items could save ~203 KB and ~406 ms

A+
Resource Caching
All resources properly cached
PASS
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+
Critical Rendering Path
No render-blocking resources
PASS
No render-blocking resources
Info::
No render-blocking resources detected
A+
Resource Hints
9 hints, 0 missing preconnects
PASS
9 hints, 0 missing preconnects
Info::
Page uses 9 resource hint(s)

Current Resource Hints

preconnect
—
preload
9
dns-prefetch
—
prefetch
—

9 resource hints configured

A+
Render-Blocking Resources
No render-blocking resources detected
PASS
No render-blocking resources detected
Info::
No render-blocking resources detected in <head>
A+
Third-Party Resources
No third-party resources detected
PASS
No third-party resources detected
Network Waterfall
167 requests over 1987ms
INFO
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https://stats.g.doubleclick.net/g/collect?v=2&tid=G-BYN8CM9PTN&cid=2110121830.1776819545&gtm=45je64h1v9103256085z89234804158za20gzb9234804158zd9234804158&rcb=12&aip=1&dma=1&dma_cps=a&gcd=13l3l3l2l1l1&npa=1&frm=0&tag_exp=0~115938466~115938469~117266401~117512543 — 204 — 558 B — 93 ms — h2https://www.google.es/ads/ga-audiences?v=1&t=sr&slf_rd=1&_r=4&tid=G-BYN8CM9PTN&cid=2110121830.1776819545&gtm=45je64h1v9103256085z89234804158za20gzb9234804158zd9234804158&rcb=12&aip=1&dma=1&dma_cps=a&gcd=13l3l3l2l1l1&npa=1&frm=0&tag_exp=0~115938466~115938469~117266401~117512543&z=122325420www.google.es/ads/ga-audiences?v=1&... https://www.google.es/ads/ga-audiences?v=1&t=sr&slf_rd=1&_r=4&tid=G-BYN8CM9PTN&cid=2110121830.1776819545&gtm=45je64h1v9103256085z89234804158za20gzb9234804158zd9234804158&rcb=12&aip=1&dma=1&dma_cps=a&gcd=13l3l3l2l1l1&npa=1&frm=0&tag_exp=0~115938466~115938469~117266401~117512543&z=122325420 — 200 — 408 B — 97 ms — h2https://www.keio.ac.jp/_astro/index.BYqHlRRY.js/_astro/index.BYqHlRRY.js https://www.keio.ac.jp/_astro/index.BYqHlRRY.js — 200 — 3.1 KiB — 16 ms — h3https://www.keio.ac.jp/_astro/client.B9bUpm8d.js/_astro/client.B9bUpm8d.js https://www.keio.ac.jp/_astro/client.B9bUpm8d.js — 200 — 54.5 KiB — 17 ms — h3https://www.keio.ac.jp/_astro/index.C5FQdnrb.js/_astro/index.C5FQdnrb.js https://www.keio.ac.jp/_astro/index.C5FQdnrb.js — 200 — 3.8 KiB — 14 ms — h3https://www.keio.ac.jp/_astro/index.BG4K5t1s.js/_astro/index.BG4K5t1s.js https://www.keio.ac.jp/_astro/index.BG4K5t1s.js — 200 — 2.6 KiB — 13 ms — h3data:image/svg+xml,%3Csvg%20xmlns%3D'http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg'%20width%3D'4'%20height%3…data:image/svg+xml,%3Csvg%20xmlns%3... data:image/svg+xml,%3Csvg%20xmlns%3D'http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg'%20width%3D'4'%20height%3… — 200 — 0 B — 0 ms — datahttps://www.keio.ac.jp/images/top-overall-main-menu-links/admissions.webp/images/top-overall-main-menu-links... https://www.keio.ac.jp/images/top-overall-main-menu-links/admissions.webp — 200 — 299.5 KiB — 331 ms — h3https://www.keio.ac.jp/images/top-overall-main-menu-links/academics.webp/images/top-overall-main-menu-links... https://www.keio.ac.jp/images/top-overall-main-menu-links/academics.webp — 200 — 93.3 KiB — 757 ms — h3https://www.keio.ac.jp/images/top-overall-main-menu-links/research.webp/images/top-overall-main-menu-links... https://www.keio.ac.jp/images/top-overall-main-menu-links/research.webp — 200 — 125.7 KiB — 281 ms — h3https://www.keio.ac.jp/images/top-overall-main-menu-links/about-keio-university.webp/images/top-overall-main-menu-links... https://www.keio.ac.jp/images/top-overall-main-menu-links/about-keio-university.webp — 200 — 112.5 KiB — 295 ms — h3https://imagedelivery.net/B3aR18lLMvcGgAp8NIV2xQ/66b3b88b-4c00-4cc6-eb81-d0d554f54800/publicimagedelivery.net/B3aR18lLMvcGgAp8N... https://imagedelivery.net/B3aR18lLMvcGgAp8NIV2xQ/66b3b88b-4c00-4cc6-eb81-d0d554f54800/public — 200 — 308.7 KiB — 89 ms — h3https://imagedelivery.net/B3aR18lLMvcGgAp8NIV2xQ/d2eab5f9-ddca-4b3b-ba7d-67fd98e60f00/publicimagedelivery.net/B3aR18lLMvcGgAp8N... https://imagedelivery.net/B3aR18lLMvcGgAp8NIV2xQ/d2eab5f9-ddca-4b3b-ba7d-67fd98e60f00/public — 200 — 55.7 KiB — 56 ms — h3https://imagedelivery.net/B3aR18lLMvcGgAp8NIV2xQ/dc0dce88-de00-4ad9-6824-c8f804425000/publicimagedelivery.net/B3aR18lLMvcGgAp8N... https://imagedelivery.net/B3aR18lLMvcGgAp8NIV2xQ/dc0dce88-de00-4ad9-6824-c8f804425000/public — 200 — 244.3 KiB — 89 ms — h3https://imagedelivery.net/B3aR18lLMvcGgAp8NIV2xQ/bdd43c1c-00da-42b0-c015-fa22aaa39c00/publicimagedelivery.net/B3aR18lLMvcGgAp8N... https://imagedelivery.net/B3aR18lLMvcGgAp8NIV2xQ/bdd43c1c-00da-42b0-c015-fa22aaa39c00/public — 200 — 133.0 KiB — 90 ms — h3https://imagedelivery.net/B3aR18lLMvcGgAp8NIV2xQ/5ffea624-3c7f-4ab1-b809-26c76782ea00/publicimagedelivery.net/B3aR18lLMvcGgAp8N... https://imagedelivery.net/B3aR18lLMvcGgAp8NIV2xQ/5ffea624-3c7f-4ab1-b809-26c76782ea00/public — 200 — 43.5 KiB — 65 ms — h3https://imagedelivery.net/B3aR18lLMvcGgAp8NIV2xQ/39b33c33-dbf4-4439-a192-7bd0de2d4c00/publicimagedelivery.net/B3aR18lLMvcGgAp8N... https://imagedelivery.net/B3aR18lLMvcGgAp8NIV2xQ/39b33c33-dbf4-4439-a192-7bd0de2d4c00/public — 200 — 85.0 KiB — 66 ms — h3https://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/72s5ldmoou.woff2morisawafonts.net/f/01KD226HWZSFRCQ... https://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/72s5ldmoou.woff2 — 200 — 15.6 KiB — 71 ms — h2https://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/hergqzq8z8.woff2morisawafonts.net/f/01KD226HWZSFRCQ... https://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/hergqzq8z8.woff2 — 200 — 58.7 KiB — 140 ms — h2https://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/htkr59s6xs.woff2morisawafonts.net/f/01KD226HWZSFRCQ... https://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/htkr59s6xs.woff2 — 200 — 405.3 KiB — 150 ms — h2https://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/zv3ssux4mv.woff2morisawafonts.net/f/01KD226HWZSFRCQ... https://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/zv3ssux4mv.woff2 — 200 — 16.0 KiB — 67 ms — h2https://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/urqt349uv1.woff2morisawafonts.net/f/01KD226HWZSFRCQ... https://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/urqt349uv1.woff2 — 200 — 61.1 KiB — 147 ms — h2https://www.keio.ac.jp/_astro/inter-latin-400-normal.C38fXH4l.woff2/_astro/inter-latin-400-normal.C38f... https://www.keio.ac.jp/_astro/inter-latin-400-normal.C38fXH4l.woff2 — 200 — 23.5 KiB — 13 ms — h3https://www.keio.ac.jp/_astro/inter-latin-300-normal.BVlfKGgI.woff2/_astro/inter-latin-300-normal.BVlf... https://www.keio.ac.jp/_astro/inter-latin-300-normal.BVlfKGgI.woff2 — 200 — 23.8 KiB — 17 ms — h3https://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/y1vsis8ipz.woff2morisawafonts.net/f/01KD226HWZSFRCQ... https://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/y1vsis8ipz.woff2 — 200 — 66.1 KiB — 137 ms — h2https://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/4ewohjpu58.woff2morisawafonts.net/f/01KD226HWZSFRCQ... https://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/4ewohjpu58.woff2 — 200 — 60.9 KiB — 119 ms — h2https://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/jodn3efki1.woff2morisawafonts.net/f/01KD226HWZSFRCQ... https://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/jodn3efki1.woff2 — 200 — 54.7 KiB — 132 ms — h2https://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/b18ve9n44r.woff2morisawafonts.net/f/01KD226HWZSFRCQ... https://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/b18ve9n44r.woff2 — 200 — 30.1 KiB — 105 ms — h2https://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/e3ypsixjco.woff2morisawafonts.net/f/01KD226HWZSFRCQ... https://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/e3ypsixjco.woff2 — 200 — 44.2 KiB — 81 ms — h2https://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/69xkdy8e30.woff2morisawafonts.net/f/01KD226HWZSFRCQ... https://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/69xkdy8e30.woff2 — 200 — 64.8 KiB — 127 ms — h2https://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/18odm8801s.woff2morisawafonts.net/f/01KD226HWZSFRCQ... https://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/18odm8801s.woff2 — 200 — 59.3 KiB — 127 ms — h2https://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/5fw3eaa0kr.woff2morisawafonts.net/f/01KD226HWZSFRCQ... https://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/5fw3eaa0kr.woff2 — 200 — 52.2 KiB — 122 ms — h2https://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/n8huxpn8gs.woff2morisawafonts.net/f/01KD226HWZSFRCQ... https://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/n8huxpn8gs.woff2 — 200 — 17.7 KiB — 107 ms — h2https://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/dgggdzviqw.woff2morisawafonts.net/f/01KD226HWZSFRCQ... https://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/dgggdzviqw.woff2 — 200 — 30.1 KiB — 107 ms — h2https://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/j5y8sbu30n.woff2morisawafonts.net/f/01KD226HWZSFRCQ... https://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/j5y8sbu30n.woff2 — 200 — 42.7 KiB — 113 ms — h2https://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/5isqrwjuls.woff2morisawafonts.net/f/01KD226HWZSFRCQ... https://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/5isqrwjuls.woff2 — 200 — 56.7 KiB — 103 ms — h2https://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/z5jvnuuivw.woff2morisawafonts.net/f/01KD226HWZSFRCQ... https://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/z5jvnuuivw.woff2 — 200 — 58.6 KiB — 112 ms — h2https://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/hkqbhh9dqa.woff2morisawafonts.net/f/01KD226HWZSFRCQ... https://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/hkqbhh9dqa.woff2 — 200 — 17.7 KiB — 102 ms — h2https://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/oms3judamg.woff2morisawafonts.net/f/01KD226HWZSFRCQ... https://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/oms3judamg.woff2 — 200 — 61.0 KiB — 246 ms — h2https://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/u2aed8jm4l.woff2morisawafonts.net/f/01KD226HWZSFRCQ... https://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/u2aed8jm4l.woff2 — 200 — 61.9 KiB — 155 ms — h2https://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/mp6g3niysf.woff2morisawafonts.net/f/01KD226HWZSFRCQ... https://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/mp6g3niysf.woff2 — 200 — 59.0 KiB — 157 ms — h2https://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/sifycqxr4i.woff2morisawafonts.net/f/01KD226HWZSFRCQ... https://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/sifycqxr4i.woff2 — 200 — 56.0 KiB — 154 ms — h2https://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/esdohbnprp.woff2morisawafonts.net/f/01KD226HWZSFRCQ... https://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/esdohbnprp.woff2 — 200 — 54.7 KiB — 150 ms — h2https://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/9oma19ipye.woff2morisawafonts.net/f/01KD226HWZSFRCQ... https://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/9oma19ipye.woff2 — 200 — 11.3 KiB — 149 ms — h2https://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/5kp3nrkdf7.woff2morisawafonts.net/f/01KD226HWZSFRCQ... https://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/5kp3nrkdf7.woff2 — 200 — 59.4 KiB — 146 ms — h2https://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/2pzpj5x0xi.woff2morisawafonts.net/f/01KD226HWZSFRCQ... https://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/2pzpj5x0xi.woff2 — 200 — 62.6 KiB — 146 ms — h2https://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/y47019ey7k.woff2morisawafonts.net/f/01KD226HWZSFRCQ... https://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/y47019ey7k.woff2 — 200 — 66.1 KiB — 147 ms — h2https://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/grxxxu0o2c.woff2morisawafonts.net/f/01KD226HWZSFRCQ... https://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/grxxxu0o2c.woff2 — 200 — 66.3 KiB — 156 ms — h2https://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/m21olgdchu.woff2morisawafonts.net/f/01KD226HWZSFRCQ... https://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/m21olgdchu.woff2 — 200 — 13.7 KiB — 149 ms — h2https://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/yfp5udr2dp.woff2morisawafonts.net/f/01KD226HWZSFRCQ... https://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/yfp5udr2dp.woff2 — 200 — 61.5 KiB — 141 ms — h2https://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/qgqm6qjoxt.woff2morisawafonts.net/f/01KD226HWZSFRCQ... https://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/qgqm6qjoxt.woff2 — 200 — 28.3 KiB — 229 ms — h2https://www.keio.ac.jp/_astro/local-storage.BTORpVU4.js/_astro/local-storage.BTORpVU4.js https://www.keio.ac.jp/_astro/local-storage.BTORpVU4.js — 200 — 519 B — 16 ms — h3https://www.keio.ac.jp/_astro/log.BxCA4z1i.js/_astro/log.BxCA4z1i.js https://www.keio.ac.jp/_astro/log.BxCA4z1i.js — 200 — 4.0 KiB — 22 ms — h3https://www.keio.ac.jp/_astro/index.helpers.BvUnvUF8.js/_astro/index.helpers.BvUnvUF8.js https://www.keio.ac.jp/_astro/index.helpers.BvUnvUF8.js — 200 — 989 B — 22 ms — h3https://www.keio.ac.jp/_astro/client.DIzBh115.js/_astro/client.DIzBh115.js https://www.keio.ac.jp/_astro/client.DIzBh115.js — 200 — 2.9 KiB — 21 ms — h3https://www.keio.ac.jp/_astro/index.GE5qG9AT.js/_astro/index.GE5qG9AT.js https://www.keio.ac.jp/_astro/index.GE5qG9AT.js — 200 — 596 B — 21 ms — h3https://imagedelivery.net/B3aR18lLMvcGgAp8NIV2xQ/b8d9f9f5-a8aa-4958-9ce2-843459ddea00/publicimagedelivery.net/B3aR18lLMvcGgAp8N... https://imagedelivery.net/B3aR18lLMvcGgAp8NIV2xQ/b8d9f9f5-a8aa-4958-9ce2-843459ddea00/public — 200 — 363 B — 67 ms — h3https://imagedelivery.net/B3aR18lLMvcGgAp8NIV2xQ/c1c2b81a-0f22-4ac0-6729-06831fdbde00/publicimagedelivery.net/B3aR18lLMvcGgAp8N... https://imagedelivery.net/B3aR18lLMvcGgAp8NIV2xQ/c1c2b81a-0f22-4ac0-6729-06831fdbde00/public — 200 — 396 B — 67 ms — h3https://imagedelivery.net/B3aR18lLMvcGgAp8NIV2xQ/4446ee93-832e-471a-ebf8-d85a56853700/publicimagedelivery.net/B3aR18lLMvcGgAp8N... https://imagedelivery.net/B3aR18lLMvcGgAp8NIV2xQ/4446ee93-832e-471a-ebf8-d85a56853700/public — 200 — 364 B — 66 ms — h3https://imagedelivery.net/B3aR18lLMvcGgAp8NIV2xQ/1d54d96b-2fe5-43d2-1e45-8013fe140e00/publicimagedelivery.net/B3aR18lLMvcGgAp8N... https://imagedelivery.net/B3aR18lLMvcGgAp8NIV2xQ/1d54d96b-2fe5-43d2-1e45-8013fe140e00/public — 200 — 358 B — 66 ms — h3https://imagedelivery.net/B3aR18lLMvcGgAp8NIV2xQ/a0aaaa72-3edb-4bce-034f-2b9d55316c00/publicimagedelivery.net/B3aR18lLMvcGgAp8N... https://imagedelivery.net/B3aR18lLMvcGgAp8NIV2xQ/a0aaaa72-3edb-4bce-034f-2b9d55316c00/public — 200 — 359 B — 66 ms — h3https://imagedelivery.net/B3aR18lLMvcGgAp8NIV2xQ/97b2c4df-07c3-4037-9dd4-f7fcadf8b200/publicimagedelivery.net/B3aR18lLMvcGgAp8N... https://imagedelivery.net/B3aR18lLMvcGgAp8NIV2xQ/97b2c4df-07c3-4037-9dd4-f7fcadf8b200/public — 200 — 361 B — 66 ms — h3https://imagedelivery.net/B3aR18lLMvcGgAp8NIV2xQ/b65b213d-f37c-4ad7-95de-ca3487098e00/publicimagedelivery.net/B3aR18lLMvcGgAp8N... https://imagedelivery.net/B3aR18lLMvcGgAp8NIV2xQ/b65b213d-f37c-4ad7-95de-ca3487098e00/public — 200 — 395 B — 67 ms — h3https://www.keio.ac.jp/_astro/index.DwJtB2vh.js/_astro/index.DwJtB2vh.js https://www.keio.ac.jp/_astro/index.DwJtB2vh.js — 200 — 1.0 KiB — 19 ms — h3https://www.keio.ac.jp/_astro/index.CEWfqvY1.js/_astro/index.CEWfqvY1.js https://www.keio.ac.jp/_astro/index.CEWfqvY1.js — 200 — 1.1 KiB — 16 ms — h3https://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/v9kl0tu6b2.woff2morisawafonts.net/f/01KD226HWZSFRCQ... https://morisawafonts.net/f/01KD226HWZSFRCQNPFXST1Q71D/v9kl0tu6b2.woff2 — 200 — 64.1 KiB — 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h3https://www.keio.ac.jp/_astro/index.DJ2H6Djg.js/_astro/index.DJ2H6Djg.js https://www.keio.ac.jp/_astro/index.DJ2H6Djg.js — 200 — 752 B — 7 ms — h3
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
24% of JavaScript execution is third-party
First-party Third-party 1137ms · 282KB · ¥1571/mo
Unattributable
Other
Costly
Execution 627ms
Transfer 0 KB
Monthly Cost ¥866/mo
Google Tag Manager
Tag Manager
Costly
Execution 260ms
Transfer 157 KB
Unused 41%
Monthly Cost ¥359/mo
Google Tag Manager
Tag Manager
Costly
Execution 251ms
Transfer 125 KB
Unused 49%
Monthly Cost ¥347/mo

These scripts may cost more than they're worth

  • Unattributable adds 627ms and costs ~¥866/month
  • Google Tag Manager adds 260ms and costs ~¥359/month
  • Google Tag Manager adds 251ms and costs ~¥347/month

Unattributable takes 627ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

Google Tag Manager takes 260ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

Google Tag Manager takes 251ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

How third-party costs are calculated

All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

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