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https://mobygames.com

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
76
GRADE
C
FIX
4
REVIEW
3
PASS
6
INFO
2

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

Mobile Desktop
87
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
73
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
92
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
83
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.

1.25 s

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

1.99 s

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

3 ms

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

0.047

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

1.25 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.

2.05 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
6 PASS 3 REVIEW 4 FIX
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 (1.4 MiB of 1.4 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Bundles
Action
3 scripts, 615 KB unused
FIX
3 scripts, 615 KB unused
Warning::
https://www.mobygames.com/static/js/shared.9361b94...: 478 KB unused (77%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.mobygames.com/static/js/main.7c0900e4....: 73 KB unused (87%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-DF0Y...: 64 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 615 KB
615 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.mobygames.com/static/js/shared.9361b94c.js625 KB478 KB (77%)✓3rd
https://www.mobygames.com/static/js/main.7c0900e4.js84 KB73 KB (87%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-DF0Y2K8D8P158 KB64 KB (41%)✓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

F
Page Weight Inventory
Action
69 resources · 1.4 MB · 615 KB savings available
FIX
69 resources · 1.4 MB · 615 KB savings available
Warning::
Page weight 443 KB over 1MB target
Got: 1.4 MB Expected: ≤ 1 MB
Info::
~615 KB of savings available
Warning::
68 third-party resources (100% of weight)
Info::
1 resources over 200KB
69 resources · 1.4 MiB · 68 third-party 443.0 KiB over 1MB target
JavaScript 59% · 867.2 KiB
Image 36% · 522.0 KiB
Font 4% · 60.6 KiB
Document 1% · 14.2 KiB
CSS 0% · 2.1 KiB
Other 0% · 924 B

~614.7 KiB of savings available

Remove unused JavaScript: 614.7 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
Page Weight Budget
1.4 MB transferred, 69 requests
REVIEW
1.4 MB transferred, 69 requests
Info::
Page weighs 3.6 MB (1.4 MB transferred)
Warning::
JavaScript is 867 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 867 KB
Info::
69 HTTP requests
Info::
Estimated 0.30 g CO2 per page load
1.4 MB / 2.4 MB budget
1.4 MB transferred
69 requests
0.30 g CO2 per page load
JavaScript 867.2 KiB 59%
Images 514.5 KiB 35%
Fonts 60.6 KiB 4%
HTML 14.2 KiB 1%
Other 7.9 KiB 1%
CSS 2.1 KiB 0%
Other 551 B 0%
0 2.4 MB 4.9 MB
Under budget

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

C
Image Optimization
Action
57 images, 0 KB saveable
REVIEW
57 images, 0 KB saveable
Warning::
https://cdn.mobygames.com/22c838c8-f3dd-11f0-9681-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://i.imgur.com/M0SWOTC.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.mobygames.com/static/img/mobyplus.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.mobygames.com/static/img/free-mobyplus... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
57 images 514 KB
0 oversized -0 KB
13 legacy format
4 missing dimensions CLS risk

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

B
JS Execution Cost
513ms total JS execution
REVIEW
513ms total JS execution
Info::
Unattributable: 209ms CPU time
Info::
https://www.mobygames.com/: 137ms CPU time
Info::
https://www.mobygames.com/static/js/shared.9361b94...: 102ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-DF0Y...: 65ms CPU time
Warning::
Third-party scripts: 513ms (100% of total)

Main Thread Breakdown

Script Evaluation 35% Other 34% Style & Layout 17% Rendering 6% Parse HTML & CSS 5%
ScriptTotalScriptingParse/CompileParty
Unattributable209ms40ms0ms3rd
https://www.mobygames.com/137ms5ms1ms3rd
https://www.mobygames.com/static/js/shared.9361b94c.js102ms80ms3ms3rd
https://www.googletagmanager.com/gtag/js?id=G-DF0Y2K8D8P65ms54ms9ms3rd
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
2 fonts (61 KB)
PASS
2 fonts (61 KB)
Info::
2 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

2

61 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 500 ms 1.0 s 1.5 s 2.0 s FCP 1.2 s LCP 2.0 shttps://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 36.7 KiB — 76 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3KUBHMdazTgWw.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3KUBHMdazTgWw.woff2 — 23.9 KiB — 75 ms — font-display: swap
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 37 KB
Load time 76 ms
Start 533 ms
Risk FOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 24 KB
Load time 75 ms
Start 533 ms
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
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
A+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Cloudflare

Network Waterfall
69 requests over 1000ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 1.2 s LCP 2.0 shttps://mobygames.com// https://mobygames.com/ — 301 — 373 B — 66 ms — h2https://www.mobygames.com/www.mobygames.com/ https://www.mobygames.com/ — 200 — 14.2 KiB — 271 ms — h2https://www.mobygames.com/static/css/style.ba5f0ea2.csswww.mobygames.com/static/css/style.... https://www.mobygames.com/static/css/style.ba5f0ea2.css — 200 — 0 B — 2 ms — h2https://www.mobygames.com/static/img/logo.37887f87.pngwww.mobygames.com/static/img/logo.3... https://www.mobygames.com/static/img/logo.37887f87.png — 200 — 0 B — 2 ms — h2https://www.mobygames.com/static/js/shared.9361b94c.jswww.mobygames.com/static/js/shared.... https://www.mobygames.com/static/js/shared.9361b94c.js — 200 — 624.6 KiB — 147 ms — h2https://www.mobygames.com/static/js/main.7c0900e4.jswww.mobygames.com/static/js/main.7c... https://www.mobygames.com/static/js/main.7c0900e4.js — 200 — 84.2 KiB — 46 ms — h2https://fonts.googleapis.com/css2?family=Roboto:wght@400;500;700&display=swapfonts.googleapis.com/css2?family=Ro... https://fonts.googleapis.com/css2?family=Roboto:wght@400;500;700&display=swap — 200 — 2.1 KiB — 90 ms — h2https://www.mobygames.com/static/img/mobyplus.svgwww.mobygames.com/static/img/mobypl... https://www.mobygames.com/static/img/mobyplus.svg — 200 — 10.8 KiB — 29 ms — h2https://www.mobygames.com/static/img/free-mobyplus.svgwww.mobygames.com/static/img/free-m... https://www.mobygames.com/static/img/free-mobyplus.svg — 200 — 1.5 KiB — 27 ms — h2https://cdn.mobygames.com/1ced499e-abfa-11ed-b4f3-02420a000135.webpcdn.mobygames.com/1ced499e-abfa-11e... https://cdn.mobygames.com/1ced499e-abfa-11ed-b4f3-02420a000135.webp — 200 — 51.4 KiB — 32 ms — h2https://cdn.mobygames.com/8f03acde-3bf9-11f1-805a-02420a0001e4.webpcdn.mobygames.com/8f03acde-3bf9-11f... https://cdn.mobygames.com/8f03acde-3bf9-11f1-805a-02420a0001e4.webp — 200 — 18.9 KiB — 30 ms — h2https://cdn.mobygames.com/4446bcec-1e65-11f1-9a97-02420a0001aa.webpcdn.mobygames.com/4446bcec-1e65-11f... https://cdn.mobygames.com/4446bcec-1e65-11f1-9a97-02420a0001aa.webp — 200 — 13.7 KiB — 24 ms — h2https://www.googletagmanager.com/gtag/js?id=G-DF0Y2K8D8Pwww.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-DF0Y2K8D8P — 200 — 158.4 KiB — 175 ms — h2https://www.mobygames.com/static/img/icon-user.pngwww.mobygames.com/static/img/icon-u... https://www.mobygames.com/static/img/icon-user.png — 200 — 8.8 KiB — 46 ms — h2https://cdn.mobygames.com/a212fada-ab6c-11ed-8e21-02420a00019b.webpcdn.mobygames.com/a212fada-ab6c-11e... https://cdn.mobygames.com/a212fada-ab6c-11ed-8e21-02420a00019b.webp — 200 — 24.6 KiB — 46 ms — h2https://cdn.mobygames.com/25ceb690-d527-11ee-88ac-02420a000157.webpcdn.mobygames.com/25ceb690-d527-11e... https://cdn.mobygames.com/25ceb690-d527-11ee-88ac-02420a000157.webp — 200 — 9.6 KiB — 44 ms — h2https://cdn.mobygames.com/58c6533a-abe5-11ed-8621-02420a000114.webpcdn.mobygames.com/58c6533a-abe5-11e... https://cdn.mobygames.com/58c6533a-abe5-11ed-8621-02420a000114.webp — 200 — 24.3 KiB — 46 ms — h2https://cdn.mobygames.com/d2e5bf7e-38fb-11f1-bf5f-02420a0001ca.webpcdn.mobygames.com/d2e5bf7e-38fb-11f... https://cdn.mobygames.com/d2e5bf7e-38fb-11f1-bf5f-02420a0001ca.webp — 200 — 13.0 KiB — 47 ms — h2https://cdn.mobygames.com/b8cdf8fe-39b4-11f1-86d4-02420a0001ca.webpcdn.mobygames.com/b8cdf8fe-39b4-11f... https://cdn.mobygames.com/b8cdf8fe-39b4-11f1-86d4-02420a0001ca.webp — 200 — 54.7 KiB — 47 ms — h2https://cdn.mobygames.com/130d6fec-3772-11f1-aeae-02420a0001cc.webpcdn.mobygames.com/130d6fec-3772-11f... https://cdn.mobygames.com/130d6fec-3772-11f1-aeae-02420a0001cc.webp — 200 — 20.5 KiB — 47 ms — h2https://www.mobygames.com/static/img/rss.527a6688.pngwww.mobygames.com/static/img/rss.52... https://www.mobygames.com/static/img/rss.527a6688.png — 200 — 7.6 KiB — 46 ms — h2https://i.imgur.com/M0SWOTC.pngi.imgur.com/M0SWOTC.png https://i.imgur.com/M0SWOTC.png — 429 — 241 B — 18 ms — h2data:image/svg+xml;charset=utf8,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20viewBox='0%200%204%20…www.w3.org/2000/svg'%20viewBox='0%2... data:image/svg+xml;charset=utf8,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20viewBox='0%200%204%20… — 200 — 0 B — 0 ms — datahttps://www.mobygames.com/static/img/icon-link-external.c0245369.svgwww.mobygames.com/static/img/icon-l... https://www.mobygames.com/static/img/icon-link-external.c0245369.svg — 200 — 927 B — 29 ms — h2https://cdn.mobygames.com/b8d4e1ca-ab94-11ed-8b6f-02420a00019c.webpcdn.mobygames.com/b8d4e1ca-ab94-11e... https://cdn.mobygames.com/b8d4e1ca-ab94-11ed-8b6f-02420a00019c.webp — 200 — 21.7 KiB — 27 ms — h2https://www.mobygames.com/static/img/icon-user.18c2a67c.svgwww.mobygames.com/static/img/icon-u... https://www.mobygames.com/static/img/icon-user.18c2a67c.svg — 200 — 784 B — 33 ms — h2https://cdn.mobygames.com/22c838c8-f3dd-11f0-9681-02420a000149.webpcdn.mobygames.com/22c838c8-f3dd-11f... https://cdn.mobygames.com/22c838c8-f3dd-11f0-9681-02420a000149.webp — 200 — 30.0 KiB — 32 ms — h2https://www.mobygames.com/static/img/icon-company.e8a75a5b.svgwww.mobygames.com/static/img/icon-c... https://www.mobygames.com/static/img/icon-company.e8a75a5b.svg — 200 — 1.4 KiB — 35 ms — h2https://www.mobygames.com/static/img/icon-group.977f0cc8.svgwww.mobygames.com/static/img/icon-g... https://www.mobygames.com/static/img/icon-group.977f0cc8.svg — 200 — 1.5 KiB — 33 ms — h2https://www.mobygames.com/static/img/icon-game.05a43e6e.svgwww.mobygames.com/static/img/icon-g... https://www.mobygames.com/static/img/icon-game.05a43e6e.svg — 200 — 947 B — 34 ms — h2
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 1.2 s LCP 2.0 shttps://mobygames.com// https://mobygames.com/ — 301 — 373 B — 66 ms — h2https://www.mobygames.com/www.mobygames.com/ https://www.mobygames.com/ — 200 — 14.2 KiB — 271 ms — h2https://www.mobygames.com/static/css/style.ba5f0ea2.csswww.mobygames.com/static/css/style.... https://www.mobygames.com/static/css/style.ba5f0ea2.css — 200 — 0 B — 2 ms — h2https://www.mobygames.com/static/img/logo.37887f87.pngwww.mobygames.com/static/img/logo.3... https://www.mobygames.com/static/img/logo.37887f87.png — 200 — 0 B — 2 ms — h2https://www.mobygames.com/static/js/shared.9361b94c.jswww.mobygames.com/static/js/shared.... https://www.mobygames.com/static/js/shared.9361b94c.js — 200 — 624.6 KiB — 147 ms — h2https://www.mobygames.com/static/js/main.7c0900e4.jswww.mobygames.com/static/js/main.7c... https://www.mobygames.com/static/js/main.7c0900e4.js — 200 — 84.2 KiB — 46 ms — h2https://fonts.googleapis.com/css2?family=Roboto:wght@400;500;700&display=swapfonts.googleapis.com/css2?family=Ro... https://fonts.googleapis.com/css2?family=Roboto:wght@400;500;700&display=swap — 200 — 2.1 KiB — 90 ms — h2https://www.mobygames.com/static/img/mobyplus.svgwww.mobygames.com/static/img/mobypl... https://www.mobygames.com/static/img/mobyplus.svg — 200 — 10.8 KiB — 29 ms — h2https://www.mobygames.com/static/img/free-mobyplus.svgwww.mobygames.com/static/img/free-m... https://www.mobygames.com/static/img/free-mobyplus.svg — 200 — 1.5 KiB — 27 ms — h2https://cdn.mobygames.com/1ced499e-abfa-11ed-b4f3-02420a000135.webpcdn.mobygames.com/1ced499e-abfa-11e... https://cdn.mobygames.com/1ced499e-abfa-11ed-b4f3-02420a000135.webp — 200 — 51.4 KiB — 32 ms — h2https://cdn.mobygames.com/8f03acde-3bf9-11f1-805a-02420a0001e4.webpcdn.mobygames.com/8f03acde-3bf9-11f... https://cdn.mobygames.com/8f03acde-3bf9-11f1-805a-02420a0001e4.webp — 200 — 18.9 KiB — 30 ms — h2https://cdn.mobygames.com/4446bcec-1e65-11f1-9a97-02420a0001aa.webpcdn.mobygames.com/4446bcec-1e65-11f... https://cdn.mobygames.com/4446bcec-1e65-11f1-9a97-02420a0001aa.webp — 200 — 13.7 KiB — 24 ms — h2https://www.googletagmanager.com/gtag/js?id=G-DF0Y2K8D8Pwww.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-DF0Y2K8D8P — 200 — 158.4 KiB — 175 ms — h2https://www.mobygames.com/static/img/icon-user.pngwww.mobygames.com/static/img/icon-u... https://www.mobygames.com/static/img/icon-user.png — 200 — 8.8 KiB — 46 ms — h2https://cdn.mobygames.com/a212fada-ab6c-11ed-8e21-02420a00019b.webpcdn.mobygames.com/a212fada-ab6c-11e... https://cdn.mobygames.com/a212fada-ab6c-11ed-8e21-02420a00019b.webp — 200 — 24.6 KiB — 46 ms — h2https://cdn.mobygames.com/25ceb690-d527-11ee-88ac-02420a000157.webpcdn.mobygames.com/25ceb690-d527-11e... https://cdn.mobygames.com/25ceb690-d527-11ee-88ac-02420a000157.webp — 200 — 9.6 KiB — 44 ms — h2https://cdn.mobygames.com/58c6533a-abe5-11ed-8621-02420a000114.webpcdn.mobygames.com/58c6533a-abe5-11e... https://cdn.mobygames.com/58c6533a-abe5-11ed-8621-02420a000114.webp — 200 — 24.3 KiB — 46 ms — h2https://cdn.mobygames.com/d2e5bf7e-38fb-11f1-bf5f-02420a0001ca.webpcdn.mobygames.com/d2e5bf7e-38fb-11f... https://cdn.mobygames.com/d2e5bf7e-38fb-11f1-bf5f-02420a0001ca.webp — 200 — 13.0 KiB — 47 ms — h2https://cdn.mobygames.com/b8cdf8fe-39b4-11f1-86d4-02420a0001ca.webpcdn.mobygames.com/b8cdf8fe-39b4-11f... https://cdn.mobygames.com/b8cdf8fe-39b4-11f1-86d4-02420a0001ca.webp — 200 — 54.7 KiB — 47 ms — h2https://cdn.mobygames.com/130d6fec-3772-11f1-aeae-02420a0001cc.webpcdn.mobygames.com/130d6fec-3772-11f... https://cdn.mobygames.com/130d6fec-3772-11f1-aeae-02420a0001cc.webp — 200 — 20.5 KiB — 47 ms — h2https://www.mobygames.com/static/img/rss.527a6688.pngwww.mobygames.com/static/img/rss.52... https://www.mobygames.com/static/img/rss.527a6688.png — 200 — 7.6 KiB — 46 ms — h2https://i.imgur.com/M0SWOTC.pngi.imgur.com/M0SWOTC.png https://i.imgur.com/M0SWOTC.png — 429 — 241 B — 18 ms — h2data:image/svg+xml;charset=utf8,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20viewBox='0%200%204%20…www.w3.org/2000/svg'%20viewBox='0%2... data:image/svg+xml;charset=utf8,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20viewBox='0%200%204%20… — 200 — 0 B — 0 ms — datahttps://www.mobygames.com/static/img/icon-link-external.c0245369.svgwww.mobygames.com/static/img/icon-l... https://www.mobygames.com/static/img/icon-link-external.c0245369.svg — 200 — 927 B — 29 ms — h2https://cdn.mobygames.com/b8d4e1ca-ab94-11ed-8b6f-02420a00019c.webpcdn.mobygames.com/b8d4e1ca-ab94-11e... https://cdn.mobygames.com/b8d4e1ca-ab94-11ed-8b6f-02420a00019c.webp — 200 — 21.7 KiB — 27 ms — h2https://www.mobygames.com/static/img/icon-user.18c2a67c.svgwww.mobygames.com/static/img/icon-u... https://www.mobygames.com/static/img/icon-user.18c2a67c.svg — 200 — 784 B — 33 ms — 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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 513ms · 797KB · $7/mo
Unattributable
Other
Costly
Execution 209ms
Transfer 0 KB
Monthly Cost $3/mo
www.mobygames.com
Other
Optional
Execution 137ms
Transfer 14 KB
Monthly Cost $2/mo
www.mobygames.com
Other
Optional
Execution 102ms
Transfer 625 KB
Unused 77%
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 65ms
Transfer 158 KB
Unused 41%
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • Unattributable adds 209ms and costs ~$3/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

Unattributable takes 209ms 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

77% of www.mobygames.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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