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https://joins.com

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
95
GRADE
A
FIX
2
REVIEW
1
PASS
12
INFO
2

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

Mobile Desktop
98
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
85
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
96
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
91
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.

1.67 s

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

1.67 s

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

0 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.

3.65 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.

1.67 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
12 PASS 1 REVIEW 2 FIX
D
Third-Party Impact
Action
76% third-party, 0 ms blocking
FIX
76% third-party, 0 ms blocking
Warning::
Third-party code accounts for 76% of page weight (7.9 KiB of 10.5 KiB)
Info::
Third-party blocking time is low (0 ms)
24%
76%
First-party Third-party
D
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.
Info::
ETag present — enables conditional (304) responses
Info::
Last-Modified header present

No Cache-Control header

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

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

Green Hosting

No green hosting detected

A+
Page Weight Budget
10 KB transferred, 12 requests
PASS
10 KB transferred, 12 requests
Info::
Page weighs 33 KB (10 KB transferred)
Info::
12 HTTP requests
Info::
Estimated 0.00 g CO2 per page load
10 KB / 2.4 MB budget
10 KB transferred
12 requests
0.00 g CO2 per page load
CSS 7.9 KiB 76%
HTML 1.3 KiB 12%
Other 1.3 KiB 12%
Images 0 B 0%
Fonts 0 B 0%
0 2.4 MB 4.9 MB
Under budget
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
1 images, 0 KB saveable
PASS
1 images, 0 KB saveable
Info::
All images are well-optimized
1 images 0 KB
0 oversized -0 KB
0 legacy format
0 missing dimensions CLS risk
A+
JS Execution Cost
195ms total JS execution
PASS
195ms total JS execution
Info::
https://joins.com/: 117ms CPU time
Info::
Unattributable: 78ms CPU time
Info::
Third-party scripts: 78ms (40% of total)

Main Thread Breakdown

Other 46% Style & Layout 43% Script Evaluation 5% Rendering 3%
ScriptTotalScriptingParse/CompileParty
https://joins.com/117ms3ms0ms1st
Unattributable78ms4ms0ms3rd
A+
Font Loading
6 fonts (0 KB)
PASS
6 fonts (0 KB)
Info::
6 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

6

0 KB total

Render-blocking

0

of 6

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 1.7 s LCP 1.7 shttps://fonts.gstatic.com/ea/notosanskr/v2/NotoSansKR-Bold.woff2NotoSansKR-Bold.woff2 https://fonts.gstatic.com/ea/notosanskr/v2/NotoSansKR-Bold.woff2 — 0 B — 66 ms — font-display: swaphttps://fonts.gstatic.com/ea/notosanskr/v2/NotoSansKR-Regular.woff2NotoSansKR-Regular.woff2 https://fonts.gstatic.com/ea/notosanskr/v2/NotoSansKR-Regular.woff2 — 0 B — 68 ms — font-display: swaphttps://fonts.gstatic.com/ea/notosanskr/v2/NotoSansKR-Bold.woffNotoSansKR-Bold.woff https://fonts.gstatic.com/ea/notosanskr/v2/NotoSansKR-Bold.woff — 0 B — 29 ms — font-display: swaphttps://fonts.gstatic.com/ea/notosanskr/v2/NotoSansKR-Regular.woffNotoSansKR-Regular.woff https://fonts.gstatic.com/ea/notosanskr/v2/NotoSansKR-Regular.woff — 0 B — 29 ms — font-display: swaphttps://fonts.gstatic.com/ea/notosanskr/v2/NotoSansKR-Bold.otfNotoSansKR-Bold.otf https://fonts.gstatic.com/ea/notosanskr/v2/NotoSansKR-Bold.otf — 0 B — 29 ms — font-display: swaphttps://fonts.gstatic.com/ea/notosanskr/v2/NotoSansKR-Regular.otfNotoSansKR-Regular.otf https://fonts.gstatic.com/ea/notosanskr/v2/NotoSansKR-Regular.otf — 0 B — 30 ms — font-display: swap
NotoSansKR-Bold.woff2 woff2 swap
Size 0 KB
Load time 66 ms
Start 2.1 s
Risk FOUT — text flashes from fallback to web font
NotoSansKR-Regular.woff2 woff2 swap
Size 0 KB
Load time 68 ms
Start 2.1 s
Risk FOUT — text flashes from fallback to web font
NotoSansKR-Bold.woff woff swap
Size 0 KB
Load time 29 ms
Start 2.2 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
NotoSansKR-Regular.woff woff swap
Size 0 KB
Load time 29 ms
Start 2.2 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
NotoSansKR-Bold.otf otf swap
Size 0 KB
Load time 29 ms
Start 2.2 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
NotoSansKR-Regular.otf otf swap
Size 0 KB
Load time 30 ms
Start 2.2 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)
A+
JS Bundles
No JavaScript
PASS
No JavaScript
Info::
No JavaScript bundles
No JavaScript files loaded.
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
A
Page Weight Inventory
12 resources · 10 KB · 0 KB savings available
PASS
12 resources · 10 KB · 0 KB savings available
Info::
Within 1MB page-weight target
Got: 10 KB
Warning::
10 third-party resources (76% of weight)
12 resources · 10.5 KiB · 10 third-party Within 1MB page-weight target
CSS 76% · 7.9 KiB
Document 24% · 2.6 KiB
Image 0% · 0 B
Font 0% · 0 B
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
12 requests over 2411ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 1.7 s LCP 1.7 shttps://joins.com// https://joins.com/ — 200 — 1.3 KiB — 881 ms — http/1.1https://static.joins.com/mobile/ui/css/joins2024/common.css?202408281544static.joins.com/mobile/ui/css/join... https://static.joins.com/mobile/ui/css/joins2024/common.css?202408281544 — 200 — 6.6 KiB — 905 ms — h2https://static.joins.com/mobile/ui/css/joins2024/notosanskr2.cssstatic.joins.com/mobile/ui/css/join... https://static.joins.com/mobile/ui/css/joins2024/notosanskr2.css — 200 — 557 B — 292 ms — h2https://static.joins.com/mobile/ui/css/joins2024/opensans.cssstatic.joins.com/mobile/ui/css/join... https://static.joins.com/mobile/ui/css/joins2024/opensans.css — 200 — 783 B — 293 ms — h2data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' width='40' height='40'%3…www.w3.org/2000/svg' width='40' hei... data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' width='40' height='40'%3… — 200 — 0 B — 0 ms — datahttps://fonts.gstatic.com/ea/notosanskr/v2/NotoSansKR-Bold.woff2fonts.gstatic.com/ea/notosanskr/v2/... https://fonts.gstatic.com/ea/notosanskr/v2/NotoSansKR-Bold.woff2 — -1 — 0 B — 66 ms — https://fonts.gstatic.com/ea/notosanskr/v2/NotoSansKR-Regular.woff2fonts.gstatic.com/ea/notosanskr/v2/... https://fonts.gstatic.com/ea/notosanskr/v2/NotoSansKR-Regular.woff2 — -1 — 0 B — 68 ms — https://joins.com/favicon.ico/favicon.ico https://joins.com/favicon.ico — 200 — 1.3 KiB — 288 ms — http/1.1https://fonts.gstatic.com/ea/notosanskr/v2/NotoSansKR-Bold.wofffonts.gstatic.com/ea/notosanskr/v2/... https://fonts.gstatic.com/ea/notosanskr/v2/NotoSansKR-Bold.woff — -1 — 0 B — 29 ms — https://fonts.gstatic.com/ea/notosanskr/v2/NotoSansKR-Regular.wofffonts.gstatic.com/ea/notosanskr/v2/... https://fonts.gstatic.com/ea/notosanskr/v2/NotoSansKR-Regular.woff — -1 — 0 B — 29 ms — https://fonts.gstatic.com/ea/notosanskr/v2/NotoSansKR-Bold.otffonts.gstatic.com/ea/notosanskr/v2/... https://fonts.gstatic.com/ea/notosanskr/v2/NotoSansKR-Bold.otf — -1 — 0 B — 29 ms — https://fonts.gstatic.com/ea/notosanskr/v2/NotoSansKR-Regular.otffonts.gstatic.com/ea/notosanskr/v2/... https://fonts.gstatic.com/ea/notosanskr/v2/NotoSansKR-Regular.otf — -1 — 0 B — 30 ms —
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
40% of JavaScript execution is third-party
First-party Third-party 78ms · 0KB · ₩309/mo
Unattributable
Other
Costly
Execution 78ms
Transfer 0 KB
Monthly Cost ₩309/mo

These scripts may cost more than they're worth

  • Unattributable adds 78ms and costs ~₩309/month

40% of JavaScript execution time comes from third-party scripts.

Why this matters

Third-party scripts (analytics, ads, social, A/B testing) often dominate execution time — every one is a perf-and-privacy tax.

Learn more ▾

Each third-party script is a black box: you don't control when it loads, what it executes, or how much it grows. They often account for a major share of total blocking time on average sites (HTTP Archive's Web Almanac documents the trend). Audit which ones you actually need, defer the rest, and use facade patterns (lite-youtube, lite-vimeo) for embedded media.

Source: web.dev / HTTP Archive Web Almanac

Unattributable takes 78ms 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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