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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
77
GRADE
C
FIX
4
REVIEW
4
PASS
5
INFO
2

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

Mobile Desktop
71
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
86
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.
85
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.

1.73 s

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

3.16 s

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

121 ms

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

0.008

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

2.08 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.

3.17 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
15
5 PASS 4 REVIEW 4 FIX
D
Page Weight Budget
Action
2.2 MB transferred, 64 requests
FIX
2.2 MB transferred, 64 requests
Info::
Page weighs 5.1 MB (2.2 MB transferred)
Warning::
JavaScript is 764 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 764 KB
Info::
Fonts are 516 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 516 KB
Info::
64 HTTP requests
Info::
Estimated 0.46 g CO2 per page load
2.2 MB / 2.4 MB budget
2.2 MB transferred
64 requests
0.46 g CO2 per page load
JavaScript 764.3 KiB 34%
Images 658.0 KiB 29%
Fonts 516.4 KiB 23%
CSS 177.7 KiB 8%
HTML 134.0 KiB 6%
Other 2.3 KiB 0%
Other 1.1 KiB 0%
Other 662 B 0%
0 2.4 MB 4.9 MB
Approaching limit

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

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

D
Third-Party Impact
Action
100% third-party, 0 ms blocking
FIX
100% third-party, 0 ms blocking
Warning::
Third-party code accounts for 100% of page weight (2.2 MiB of 2.2 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
Page Weight Inventory
Action
64 resources · 2.2 MB · 265 KB savings available
FIX
64 resources · 2.2 MB · 265 KB savings available
Warning::
Page weight 1.2 MB over 1MB target
Got: 2.2 MB Expected: ≤ 1 MB
Info::
~265 KB of savings available
Warning::
63 third-party resources (100% of weight)
Info::
1 resources over 200KB
64 resources · 2.2 MiB · 63 third-party 1.2 MiB over 1MB target
JavaScript 34% · 764.3 KiB
Image 29% · 660.2 KiB
Font 23% · 516.4 KiB
CSS 8% · 177.7 KiB
Document 6% · 134.0 KiB
Other 0% · 1.8 KiB

~264.8 KiB of savings available

Remove unused JavaScript: 264.8 KiB
F
HTTP Caching
Action
No cache headers
FIX
No cache headers
Warning::
No Cache-Control header found
Browsers will use heuristic caching, which can be unpredictable. Set explicit cache headers.

No Cache-Control header

Adding a Cache-Control header can significantly improve repeat-visit performance.

B
Image Optimization
12 images, 0 KB saveable
REVIEW
12 images, 0 KB saveable
Info::
All images are well-optimized
12 images 658 KB
0 oversized -0 KB
12 legacy format
0 missing dimensions CLS risk
C
JS Execution Cost
Action
1073ms total JS execution
REVIEW
1073ms total JS execution
Warning::
https://www.bu.edu/: 371ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-0Z1E...: 149ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-HVBY...: 126ms CPU time
Info::
Unattributable: 124ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-ZLH6...: 122ms CPU time
Warning::
Third-party scripts: 1073ms (100% of total)

Main Thread Breakdown

Script Evaluation 51% Style & Layout 18% Other 15% Script Parsing & Compilation 10% Parse HTML & CSS 4%
ScriptTotalScriptingParse/CompileParty
https://www.bu.edu/371ms95ms10ms3rd
https://www.googletagmanager.com/gtag/js?id=G-0Z1EBE5RV7149ms121ms26ms3rd
https://www.googletagmanager.com/gtag/js?id=G-HVBYYX9KF6&cx=c&gtm=4e64h1126ms106ms19ms3rd
Unattributable124ms4ms0ms3rd
https://www.googletagmanager.com/gtag/js?id=G-ZLH6JNFYKK&cx=c&gtm=4e64h1122ms96ms25ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-WRNV877113ms91ms20ms3rd
https://js-agent.newrelic.com/nr-spa-1.313.1.min.js68ms53ms4ms3rd
C
JS Bundles
Action
19 scripts, 265 KB unused
REVIEW
19 scripts, 265 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-ZLH6...: 68 KB unused (43%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-HVBY...: 65 KB unused (43%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-0Z1E...: 64 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-WRN...: 48 KB unused (48%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.bu.edu/home/js/jquery.min.js: 20 KB unused (67%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 265 KB
265 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-ZLH6JNFYKK&cx=c&gtm=4e64h1157 KB68 KB (43%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-HVBYYX9KF6&cx=c&gtm=4e64h1153 KB65 KB (43%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-0Z1EBE5RV7157 KB64 KB (41%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-WRNV877140 KB48 KB (48%)✓3rd
https://www.bu.edu/home/js/jquery.min.js31 KB20 KB (67%)✓3rd
https://www.bu.edu/home/js/bu-blocks-frontend.js11 KB—✗3rd
https://www.bu.edu/home/js/jquery.waypoints-4.0.0.min.js3 KB—✓3rd
https://www.bu.edu/home/js/tooltip.min.js3 KB—✓3rd
https://www.bu.edu/home/js/micromodal.min.js3 KB—✓3rd
https://www.bu.edu/home/js/screenfull.min.js1 KB—✓3rd

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

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

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+
Font Loading
11 fonts (516 KB)
PASS
11 fonts (516 KB)
Info::
11 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

11

516 KB total

Render-blocking

0

of 11

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 1.0 s 2.0 s 3.0 s FCP 1.7 s LCP 3.2 shttps://www.bu.edu/home/font/bu-default-icons.woffbu-default-icons.woff https://www.bu.edu/home/font/bu-default-icons.woff — 29.5 KiB — 49 ms — font-display: swaphttps://www.bu.edu/home/font/d4a4a960-2cf2-430e-8b13-cbf6f261ddb9-3.woffd4a4a960-2cf2-430e-8b13... https://www.bu.edu/home/font/d4a4a960-2cf2-430e-8b13-cbf6f261ddb9-3.woff — 36.9 KiB — 40 ms — font-display: swaphttps://www.bu.edu/home/font/019c3a13-b3d7-4c5a-be27-07a8334a43e6-3.woff019c3a13-b3d7-4c5a-be27... https://www.bu.edu/home/font/019c3a13-b3d7-4c5a-be27-07a8334a43e6-3.woff — 36.8 KiB — 50 ms — font-display: swaphttps://www.bu.edu/home/font/TiemposHeadline-Medium-Italic.woffTiemposHeadline-Medium-... https://www.bu.edu/home/font/TiemposHeadline-Medium-Italic.woff — 49.7 KiB — 66 ms — font-display: swaphttps://www.bu.edu/home/font/TiemposHeadline-Bold.woffTiemposHeadline-Bold.woff https://www.bu.edu/home/font/TiemposHeadline-Bold.woff — 47.9 KiB — 66 ms — font-display: swaphttps://www.bu.edu/home/font/TiemposHeadline-Regular-Italic.woffTiemposHeadline-Regular... https://www.bu.edu/home/font/TiemposHeadline-Regular-Italic.woff — 51.0 KiB — 62 ms — font-display: swaphttps://www.bu.edu/home/font/TiemposHeadline-Bold-Italic.woffTiemposHeadline-Bold-It... https://www.bu.edu/home/font/TiemposHeadline-Bold-Italic.woff — 49.7 KiB — 77 ms — font-display: swaphttps://www.bu.edu/home/font/8e221891-e89b-4eae-95ca-6346d9a41d20-3.woff8e221891-e89b-4eae-95ca... https://www.bu.edu/home/font/8e221891-e89b-4eae-95ca-6346d9a41d20-3.woff — 36.8 KiB — 70 ms — font-display: swaphttps://www.bu.edu/home/font/WhitneySSmAdvancedSemibold_normal_normal.woff2WhitneySSmAdvancedSemib... https://www.bu.edu/home/font/WhitneySSmAdvancedSemibold_normal_normal.woff2 — 65.3 KiB — 77 ms — font-display: swaphttps://www.bu.edu/home/font/WhitneySSmAdvancedBook_normal_normal.woff2WhitneySSmAdvancedBook_... https://www.bu.edu/home/font/WhitneySSmAdvancedBook_normal_normal.woff2 — 63.6 KiB — 84 ms — font-display: swaphttps://www.bu.edu/home/font/TiemposHeadline-Regular.woffTiemposHeadline-Regular... https://www.bu.edu/home/font/TiemposHeadline-Regular.woff — 49.2 KiB — 82 ms — font-display: swap
bu-default-icons.woff woff swap
Size 29 KB
Load time 49 ms
Start 1.7 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
d4a4a960-2cf2-430e-8b13... woff swap
Size 37 KB
Load time 40 ms
Start 1.7 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
019c3a13-b3d7-4c5a-be27... woff swap
Size 37 KB
Load time 50 ms
Start 1.7 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
TiemposHeadline-Medium-... woff swap
Size 50 KB
Load time 66 ms
Start 1.7 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
TiemposHeadline-Bold.woff woff swap
Size 48 KB
Load time 66 ms
Start 1.7 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
TiemposHeadline-Regular... woff swap
Size 51 KB
Load time 62 ms
Start 1.7 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
TiemposHeadline-Bold-It... woff swap
Size 50 KB
Load time 77 ms
Start 1.7 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
8e221891-e89b-4eae-95ca... woff swap
Size 37 KB
Load time 70 ms
Start 1.7 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
WhitneySSmAdvancedSemib... woff2 swap
Size 65 KB
Load time 77 ms
Start 1.7 s
Risk FOUT — text flashes from fallback to web font
WhitneySSmAdvancedBook_... woff2 swap
Size 64 KB
Load time 84 ms
Start 1.7 s
Risk FOUT — text flashes from fallback to web font
TiemposHeadline-Regular... woff swap
Size 49 KB
Load time 82 ms
Start 1.7 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
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 ~116 KB and ~232 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
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
Network Waterfall
64 requests over 2725ms
INFO
0 ms 1.0 s 2.0 s 3.0 s FCP 1.7 s LCP 3.2 shttps://bu.edu// https://bu.edu/ — 301 — 123 B — 688 ms — http/1.0https://www.bu.edu/www.bu.edu/ https://www.bu.edu/ — 200 — 134.0 KiB — 550 ms — http/1.1https://www.bu.edu/home/css/alert.csswww.bu.edu/home/css/alert.css https://www.bu.edu/home/css/alert.css — 200 — 1.5 KiB — 55 ms — http/1.1https://www.bu.edu/home/css/style.min.csswww.bu.edu/home/css/style.min.css https://www.bu.edu/home/css/style.min.css — 200 — 10.9 KiB — 40 ms — http/1.1https://www.bu.edu/home/css/block-frontend.csswww.bu.edu/home/css/block-frontend.... https://www.bu.edu/home/css/block-frontend.css — 200 — 616 B — 25 ms — http/1.1https://www.bu.edu/home/css/bu-slideshow.csswww.bu.edu/home/css/bu-slideshow.cs... https://www.bu.edu/home/css/bu-slideshow.css — 200 — 2.5 KiB — 37 ms — http/1.1https://www.bu.edu/home/css/bu-banners.min.csswww.bu.edu/home/css/bu-banners.min.... https://www.bu.edu/home/css/bu-banners.min.css — 200 — 2.2 KiB — 33 ms — http/1.1https://www.bu.edu/home/css/style.min_1.csswww.bu.edu/home/css/style.min_1.css https://www.bu.edu/home/css/style.min_1.css — 200 — 151.8 KiB — 61 ms — http/1.1https://www.bu.edu/home/css/fonts.csswww.bu.edu/home/css/fonts.css https://www.bu.edu/home/css/fonts.css — 200 — 934 B — 50 ms — http/1.1https://www.bu.edu/home/css/zotpress.shortcode.min.csswww.bu.edu/home/css/zotpress.shortc... https://www.bu.edu/home/css/zotpress.shortcode.min.css — 200 — 1.9 KiB — 45 ms — http/1.1https://www.bu.edu/home/js/jquery.min.jswww.bu.edu/home/js/jquery.min.js https://www.bu.edu/home/js/jquery.min.js — 200 — 30.9 KiB — 65 ms — http/1.1https://www.bu.edu/home/js/jquery-migrate.min.jswww.bu.edu/home/js/jquery-migrate.m... https://www.bu.edu/home/js/jquery-migrate.min.js — 200 — 4.7 KiB — 62 ms — http/1.1https://www.bu.edu/home/js/analytics-talk-content-tracking.jswww.bu.edu/home/js/analytics-talk-c... https://www.bu.edu/home/js/analytics-talk-content-tracking.js — 200 — 1.8 KiB — 64 ms — http/1.1https://www.bu.edu/home/js/modernizr.jswww.bu.edu/home/js/modernizr.js https://www.bu.edu/home/js/modernizr.js — 200 — 11.0 KiB — 68 ms — http/1.1https://www.bu.edu/home/css/custom.min.csswww.bu.edu/home/css/custom.min.css https://www.bu.edu/home/css/custom.min.css — 200 — 4.8 KiB — 47 ms — http/1.1https://www.bu.edu/home/img/icon-buhp-rhett.pngwww.bu.edu/home/img/icon-buhp-rhett... https://www.bu.edu/home/img/icon-buhp-rhett.png — 200 — 26.0 KiB — 30 ms — http/1.1https://www.bu.edu/home/img/icon-buhp-hub.svgwww.bu.edu/home/img/icon-buhp-hub.s... https://www.bu.edu/home/img/icon-buhp-hub.svg — 200 — 1.1 KiB — 14 ms — http/1.1https://cdn.fonts.net/t/1.css?apiType=css&projectid=b6ad2f95-8b9c-41ce-8e24-66c08ae7befbcdn.fonts.net/t/1.css?apiType=css&p... https://cdn.fonts.net/t/1.css?apiType=css&projectid=b6ad2f95-8b9c-41ce-8e24-66c08ae7befb — 200 — 639 B — 45 ms — h2https://www.bu.edu/home/img/icon-buhp-giving.svgwww.bu.edu/home/img/icon-buhp-givin... https://www.bu.edu/home/img/icon-buhp-giving.svg — 200 — 1.4 KiB — 9 ms — http/1.1https://www.bu.edu/home/js/bu-blocks-frontend.jswww.bu.edu/home/js/bu-blocks-fronte... https://www.bu.edu/home/js/bu-blocks-frontend.js — 200 — 11.1 KiB — 11 ms — http/1.1https://www.bu.edu/home/js/jquery.waypoints-4.0.0.min.jswww.bu.edu/home/js/jquery.waypoints... https://www.bu.edu/home/js/jquery.waypoints-4.0.0.min.js — 200 — 3.3 KiB — 6 ms — http/1.1https://www.bu.edu/home/js/popper.min.jswww.bu.edu/home/js/popper.min.js https://www.bu.edu/home/js/popper.min.js — 200 — 7.9 KiB — 20 ms — http/1.1https://www.bu.edu/home/js/tooltip.min.jswww.bu.edu/home/js/tooltip.min.js https://www.bu.edu/home/js/tooltip.min.js — 200 — 2.8 KiB — 26 ms — http/1.1https://www.bu.edu/home/js/micromodal.min.jswww.bu.edu/home/js/micromodal.min.j... https://www.bu.edu/home/js/micromodal.min.js — 200 — 3.4 KiB — 23 ms — http/1.1https://www.bu.edu/home/js/screenfull.min.jswww.bu.edu/home/js/screenfull.min.j... https://www.bu.edu/home/js/screenfull.min.js — 200 — 1.4 KiB — 22 ms — http/1.1https://www.bu.edu/home/js/bu-prepress-frontend.jswww.bu.edu/home/js/bu-prepress-fron... https://www.bu.edu/home/js/bu-prepress-frontend.js — 200 — 21.5 KiB — 28 ms — http/1.1https://www.bu.edu/home/js/script.jswww.bu.edu/home/js/script.js https://www.bu.edu/home/js/script.js — 200 — 6.2 KiB — 29 ms — http/1.1https://www.googletagmanager.com/gtag/js?id=G-0Z1EBE5RV7www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-0Z1EBE5RV7 — 200 — 157.4 KiB — 59 ms — h2https://www.bu.edu/home/js/wp-embed.min.jswww.bu.edu/home/js/wp-embed.min.js https://www.bu.edu/home/js/wp-embed.min.js — 200 — 1.4 KiB — 11 ms — http/1.1https://www.bu.edu/wp-includes/js/wp-emoji-release.min.js?ver=5.8.10www.bu.edu/wp-includes/js/wp-emoji-... https://www.bu.edu/wp-includes/js/wp-emoji-release.min.js?ver=5.8.10 — 200 — 18.8 KiB — 242 ms — http/1.1
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https://bam.nr-data.net/events/1/b19c58809e?a=7212547&v=1.313.1&to=YV1SNkUDWEQDBRdQDFgXcQFDC1lZTQQWURMbUF8PUhJXUAc%3D&rst=2605&ck=0&s=74fc3a1013785225&ref=https://www.bu.edu/&ptid=948024b5a4e7c45b — 200 — 412 B — 95 ms — http/1.1https://bam.nr-data.net/jserrors/1/b19c58809e?a=7212547&v=1.313.1&to=YV1SNkUDWEQDBRdQDFgXcQFDC1lZTQQWURMbUF8PUhJXUAc%3D&rst=2607&ck=0&s=74fc3a1013785225&ref=https://www.bu.edu/&ptid=948024b5a4e7c45bbam.nr-data.net/jserrors/1/b19c5880... https://bam.nr-data.net/jserrors/1/b19c58809e?a=7212547&v=1.313.1&to=YV1SNkUDWEQDBRdQDFgXcQFDC1lZTQQWURMbUF8PUhJXUAc%3D&rst=2607&ck=0&s=74fc3a1013785225&ref=https://www.bu.edu/&ptid=948024b5a4e7c45b — 200 — 412 B — 102 ms — http/1.1https://bam.nr-data.net/events/1/b19c58809e?a=7212547&v=1.313.1&to=YV1SNkUDWEQDBRdQDFgXcQFDC1lZTQQWURMbUF8PUhJXUAc%3D&rst=2610&ck=0&s=74fc3a1013785225&ref=https://www.bu.edu/&ptid=948024b5a4e7c45bbam.nr-data.net/events/1/b19c58809e... https://bam.nr-data.net/events/1/b19c58809e?a=7212547&v=1.313.1&to=YV1SNkUDWEQDBRdQDFgXcQFDC1lZTQQWURMbUF8PUhJXUAc%3D&rst=2610&ck=0&s=74fc3a1013785225&ref=https://www.bu.edu/&ptid=948024b5a4e7c45b — 200 — 412 B — 106 ms — http/1.1https://bam.nr-data.net/ins/1/b19c58809e?a=7212547&v=1.313.1&to=YV1SNkUDWEQDBRdQDFgXcQFDC1lZTQQWURMbUF8PUhJXUAc%3D&rst=2612&ck=0&s=74fc3a1013785225&ref=https://www.bu.edu/&ptid=948024b5a4e7c45b&at=TRpFQA0ZSxtAB0EDGEtFbam.nr-data.net/ins/1/b19c58809e?a=... https://bam.nr-data.net/ins/1/b19c58809e?a=7212547&v=1.313.1&to=YV1SNkUDWEQDBRdQDFgXcQFDC1lZTQQWURMbUF8PUhJXUAc%3D&rst=2612&ck=0&s=74fc3a1013785225&ref=https://www.bu.edu/&ptid=948024b5a4e7c45b&at=TRpFQA0ZSxtAB0EDGEtF — 204 — 390 B — 114 ms — http/1.1
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
100% of JavaScript execution is third-party
First-party Third-party 1073ms · 772KB · $14/mo
www.bu.edu
Other
Costly
Execution 371ms
Transfer 134 KB
Monthly Cost $5/mo
Google Tag Manager
Tag Manager
Optional
Execution 149ms
Transfer 157 KB
Unused 41%
Monthly Cost $2/mo
Google Tag Manager
Tag Manager
Optional
Execution 126ms
Transfer 153 KB
Unused 43%
Monthly Cost $2/mo
Unattributable
Other
Optional
Execution 124ms
Transfer 0 KB
Monthly Cost $2/mo
Google Tag Manager
Tag Manager
Optional
Execution 122ms
Transfer 157 KB
Unused 43%
Monthly Cost $2/mo
Google Tag Manager
Tag Manager
Optional
Execution 113ms
Transfer 140 KB
Unused 48%
Monthly Cost $2/mo
js-agent.newrelic.com
Other
Optional
Execution 68ms
Transfer 30 KB
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • www.bu.edu adds 371ms and costs ~$5/month

100% of JavaScript execution time is spent on third-party scripts. Consider auditing which scripts are essential.

Why this matters

When third-party JS execution time exceeds your own, performance gains from frontend work are capped by code you don't own.

Learn more ▾

Every millisecond of third-party JS competes with your own for main-thread time. If their share is bigger than yours, optimization on your code base barely moves the needle. Audit, defer, or remove third-parties before further frontend optimization. Use Lighthouse's third-party audit to identify the worst offenders.

Source: web.dev

www.bu.edu takes 371ms 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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