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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
91
GRADE
A
FIX
2
REVIEW
2
PASS
11
INFO
2

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

Mobile Desktop
85
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
76
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
81
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.

3.25 s

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

3.25 s

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

81 ms

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

0.009

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

3.71 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.

4.24 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
11 PASS 2 REVIEW 2 FIX
D
Third-Party Impact
Action
96% third-party, 0 ms blocking
FIX
96% third-party, 0 ms blocking
Warning::
Third-party code accounts for 96% of page weight (210.2 KiB of 219.9 KiB)
Info::
Third-party blocking time is low (0 ms)
96%
First-party Third-party
D
HTTP Caching
Action
no-store (uncacheable)
FIX
no-store (uncacheable)
Info::
Cache-Control: no-store prevents all caching
Intentional for dynamic content, but increases server load for every page view.
Got: no-store, no-cache, must-revalidate
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

no-store, no-cache, must-revalidate

DirectiveValueMeaning
no-store—Never cache this response
no-cache—Cache but always revalidate first
must-revalidate—Must recheck with server after expiry
B
JS Execution Cost
725ms total JS execution
REVIEW
725ms total JS execution
Warning::
https://imgbb.com/: 318ms CPU time
Info::
Unattributable: 174ms CPU time
Info::
https://simgbb.com/8179/jqueryui2.js: 124ms CPU time
Info::
https://simgbb.com/8179/ibb.js: 109ms CPU time
Warning::
Third-party scripts: 407ms (56% of total)

Main Thread Breakdown

Style & Layout 31% Other 29% Script Evaluation 25% Script Parsing & Compilation 8% Parse HTML & CSS 4%
ScriptTotalScriptingParse/CompileParty
https://imgbb.com/318ms35ms3ms1st
Unattributable174ms6ms0ms3rd
https://simgbb.com/8179/jqueryui2.js124ms85ms30ms3rd
https://simgbb.com/8179/ibb.js109ms61ms26ms3rd
B
JS Bundles
2 scripts, 96 KB unused
REVIEW
2 scripts, 96 KB unused
Warning::
https://simgbb.com/8179/jqueryui2.js: 50 KB unused (72%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://simgbb.com/8179/ibb.js: 46 KB unused (81%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 96 KB
96 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://simgbb.com/8179/jqueryui2.js70 KB50 KB (72%)✓3rd
https://simgbb.com/8179/ibb.js57 KB46 KB (81%)✓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

A+
Page Weight Budget
220 KB transferred, 10 requests
PASS
220 KB transferred, 10 requests
Info::
Page weighs 670 KB (220 KB transferred)
Info::
10 HTTP requests
Info::
Estimated 0.05 g CO2 per page load
220 KB / 2.4 MB budget
220 KB transferred
10 requests
0.05 g CO2 per page load
JavaScript 127.7 KiB 58%
Fonts 50.5 KiB 23%
CSS 23.7 KiB 11%
HTML 9.7 KiB 4%
Other 7.3 KiB 3%
Images 1.1 KiB 1%
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 1 KB
0 oversized -0 KB
1 legacy format
0 missing dimensions CLS risk
A+
Font Loading
2 fonts (50 KB)
PASS
2 fonts (50 KB)
Info::
2 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

2

51 KB total

Render-blocking

0

of 2

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 3.3 s LCP 3.3 shttps://simgbb.com/fonts/imgbb.woff2imgbb.woff2 https://simgbb.com/fonts/imgbb.woff2 — 8.5 KiB — 653 ms — font-display: swaphttps://fonts.gstatic.com/s/opensans/v44/memvYaGs126MiZpBA-UvWbX2vVnXBbObj2OVTS-mu0SC55I.woff2memvYaGs126MiZpBA-UvWbX... https://fonts.gstatic.com/s/opensans/v44/memvYaGs126MiZpBA-UvWbX2vVnXBbObj2OVTS-mu0SC55I.woff2 — 42.0 KiB — 7 ms — font-display: swap
imgbb.woff2 woff2 swap
Size 9 KB
Load time 653 ms
Start 1.6 s
Risk FOUT — text flashes from fallback to web font
memvYaGs126MiZpBA-UvWbX... woff2 swap
Size 42 KB
Load time 7 ms
Start 1.6 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)
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
3 hints, 0 missing preconnects
PASS
3 hints, 0 missing preconnects
Info::
Page uses 3 resource hint(s)

Current Resource Hints

preconnect
3
preload
—
dns-prefetch
—
prefetch
—

3 resource hints configured

A
Page Weight Inventory
10 resources · 220 KB · 96 KB savings available
PASS
10 resources · 220 KB · 96 KB savings available
Info::
Within 1MB page-weight target
Got: 220 KB
Info::
~96 KB of savings available
Warning::
9 third-party resources (96% of weight)
10 resources · 219.9 KiB · 9 third-party Within 1MB page-weight target
JavaScript 58% · 127.7 KiB
Font 23% · 50.5 KiB
CSS 11% · 23.7 KiB
Document 4% · 9.7 KiB
Image 4% · 8.4 KiB

~96.4 KiB of savings available

Remove unused JavaScript: 96.4 KiB
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
A+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: OVHcloud

Network Waterfall
10 requests over 2447ms
INFO
0 ms 1.0 s 2.0 s 3.0 s FCP 3.3 s LCP 3.3 shttps://imgbb.com// https://imgbb.com/ — 200 — 9.7 KiB — 665 ms — h2https://fonts.googleapis.com/css2?family=Open+Sans:wght@300;400;500&display=swapfonts.googleapis.com/css2?family=Op... https://fonts.googleapis.com/css2?family=Open+Sans:wght@300;400;500&display=swap — 200 — 2.2 KiB — 127 ms — h2https://simgbb.com/8179/ibb.csssimgbb.com/8179/ibb.css https://simgbb.com/8179/ibb.css — 200 — 21.5 KiB — 838 ms — h2https://simgbb.com/images/logo.pngsimgbb.com/images/logo.png https://simgbb.com/images/logo.png — 200 — 1.1 KiB — 735 ms — h2https://simgbb.com/8179/jqueryui2.jssimgbb.com/8179/jqueryui2.js https://simgbb.com/8179/jqueryui2.js — 200 — 70.3 KiB — 584 ms — h2https://simgbb.com/8179/ibb.jssimgbb.com/8179/ibb.js https://simgbb.com/8179/ibb.js — 200 — 57.4 KiB — 658 ms — h2https://simgbb.com/fonts/imgbb.woff2simgbb.com/fonts/imgbb.woff2 https://simgbb.com/fonts/imgbb.woff2 — 200 — 8.5 KiB — 653 ms — h2https://fonts.gstatic.com/s/opensans/v44/memvYaGs126MiZpBA-UvWbX2vVnXBbObj2OVTS-mu0SC55I.woff2fonts.gstatic.com/s/opensans/v44/me... https://fonts.gstatic.com/s/opensans/v44/memvYaGs126MiZpBA-UvWbX2vVnXBbObj2OVTS-mu0SC55I.woff2 — 200 — 42.0 KiB — 7 ms — h3https://simgbb.com/images/favicon.pngsimgbb.com/images/favicon.png https://simgbb.com/images/favicon.png — 200 — 7.3 KiB — 224 ms — h2https://simgbb.com/images/favicon.pngsimgbb.com/images/favicon.png https://simgbb.com/images/favicon.png — 200 — 0 B — 2 ms — h2
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
56% of JavaScript execution is third-party
First-party Third-party 407ms · 128KB · €4/mo
Unattributable
Other
Optional
Execution 174ms
Transfer 0 KB
Monthly Cost €2/mo
simgbb.com
Other
Optional
Execution 124ms
Transfer 70 KB
Unused 72%
Monthly Cost €1/mo
simgbb.com
Other
Optional
Execution 109ms
Transfer 57 KB
Unused 81%
Monthly Cost €1/mo

56% 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

72% of simgbb.com's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

81% of simgbb.com's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

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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