Skip to content
https://nuget.org

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
88
GRADE
B
FIX
2
REVIEW
3
PASS
8
INFO
2

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

Mobile Desktop
82
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.
96
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
92
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.

1.69 s

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

1.97 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.

0.059

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

1.86 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.

1.97 s

Page Load Progression

558 ms
1.1 s
1.7 s
2.2 s
2.8 s
3.4 s
3.9 s
4.5 s
Checks
15
8 PASS 3 REVIEW 2 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 (697.5 KiB of 699.1 KiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
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
5 images, 0 KB saveable
REVIEW
5 images, 0 KB saveable
Info::
All images are well-optimized
5 images 37 KB
0 oversized -0 KB
5 legacy format
0 missing dimensions CLS risk
B
JS Bundles
3 scripts, 62 KB unused
REVIEW
3 scripts, 62 KB unused
Warning::
https://www.nuget.org/Scripts/gallery/site.min.js?...: 62 KB unused (64%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 62 KB
62 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.nuget.org/Scripts/gallery/site.min.js?v=9352ShibzZ-oY8G2paDIJFoRoTrWghNF7YlXi2tc4d0198 KB62 KB (64%)✓3rd
https://wcpstatic.microsoft.com/mscc/lib/v2/wcp-consent.js274 KB—✓3rd
https://www.nuget.org/Scripts/gallery/page-home.min.js?v=49avs5MpLWP-MC3EThOG_qqrwX9Dm7HC9pEs04f_DmU13 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

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

Green Hosting

No green hosting detected

A+
Page Weight Budget
699 KB transferred, 18 requests
PASS
699 KB transferred, 18 requests
Info::
Page weighs 1.3 MB (699 KB transferred)
Info::
18 HTTP requests
Info::
Estimated 0.14 g CO2 per page load
699 KB / 2.4 MB budget
699 KB transferred
18 requests
0.14 g CO2 per page load
JavaScript 374.2 KiB 54%
Fonts 193.9 KiB 28%
CSS 69.3 KiB 10%
Images 36.9 KiB 5%
Other 17.9 KiB 3%
HTML 5.4 KiB 1%
Other 1.7 KiB 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+
JS Execution Cost
392ms total JS execution
PASS
392ms total JS execution
Info::
https://www.nuget.org/: 164ms CPU time
Info::
https://www.nuget.org/Scripts/gallery/site.min.js?...: 148ms CPU time
Info::
Unattributable: 80ms CPU time
Warning::
Third-party scripts: 392ms (100% of total)

Main Thread Breakdown

Other 49% Script Evaluation 22% Style & Layout 15% Rendering 5% Script Parsing & Compilation 5% Parse HTML & CSS 4%
ScriptTotalScriptingParse/CompileParty
https://www.nuget.org/164ms3ms1ms3rd
https://www.nuget.org/Scripts/gallery/site.min.js?v=9352ShibzZ-oY8G2paDIJFoRoTrWghNF7YlXi2tc4d01148ms81ms11ms3rd
Unattributable80ms2ms0ms3rd
A+
Font Loading
1 fonts (194 KB)
PASS
1 fonts (194 KB)
Info::
1 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

1

194 KB total

Render-blocking

0

of 1

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 2.0 shttps://res-1.cdn.office.net/files/fabric-cdn-prod_20221201.001/assets/icons/fabricmdl2icons-3.70.wofffabricmdl2icons-3.70.woff https://res-1.cdn.office.net/files/fabric-cdn-prod_20221201.001/assets/icons/fabricmdl2icons-3.70.woff — 193.9 KiB — 29 ms — font-display: swap
fabricmdl2icons-3.70.woff woff swap
Size 194 KB
Load time 29 ms
Start 1.5 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
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 ~155 KB and ~310 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
A
Page Weight Inventory
18 resources · 699 KB · 62 KB savings available
PASS
18 resources · 699 KB · 62 KB savings available
Info::
Within 1MB page-weight target
Got: 699 KB
Info::
~62 KB of savings available
Warning::
14 third-party resources (100% of weight)
Info::
1 resources over 200KB
18 resources · 699.1 KiB · 14 third-party Within 1MB page-weight target
JavaScript 54% · 374.2 KiB
Font 28% · 193.9 KiB
CSS 10% · 69.3 KiB
Image 8% · 53.1 KiB
Document 1% · 7.0 KiB
Other 0% · 1.7 KiB

~61.8 KiB of savings available

Remove unused JavaScript: 61.8 KiB
Network Waterfall
18 requests over 2350ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 1.7 s LCP 2.0 shttps://nuget.org// https://nuget.org/ — 301 — 596 B — 311 ms — http/1.1https://www.nuget.org/www.nuget.org/ https://www.nuget.org/ — 200 — 5.4 KiB — 580 ms — http/1.1https://www.nuget.org/Content/gallery/css/site.min.css?v=1na5Q3HPVSkugniYsNxjmE134E1C4dpzFOT5rmDYA-E1www.nuget.org/Content/gallery/css/s... https://www.nuget.org/Content/gallery/css/site.min.css?v=1na5Q3HPVSkugniYsNxjmE134E1C4dpzFOT5rmDYA-E1 — 200 — 32.6 KiB — 454 ms — http/1.1https://www.nuget.org/Content/gallery/css/bootstrap.min.csswww.nuget.org/Content/gallery/css/b... https://www.nuget.org/Content/gallery/css/bootstrap.min.css — 200 — 36.7 KiB — 620 ms — http/1.1https://wcpstatic.microsoft.com/mscc/lib/v2/wcp-consent.jswcpstatic.microsoft.com/mscc/lib/v2... https://wcpstatic.microsoft.com/mscc/lib/v2/wcp-consent.js — 200 — 273.7 KiB — 1.3 s — h2https://www.nuget.org/Scripts/gallery/site.min.js?v=9352ShibzZ-oY8G2paDIJFoRoTrWghNF7YlXi2tc4d01www.nuget.org/Scripts/gallery/site.... https://www.nuget.org/Scripts/gallery/site.min.js?v=9352ShibzZ-oY8G2paDIJFoRoTrWghNF7YlXi2tc4d01 — 200 — 97.8 KiB — 732 ms — http/1.1https://www.nuget.org/Scripts/gallery/page-home.min.js?v=49avs5MpLWP-MC3EThOG_qqrwX9Dm7HC9pEs04f_DmU1www.nuget.org/Scripts/gallery/page-... https://www.nuget.org/Scripts/gallery/page-home.min.js?v=49avs5MpLWP-MC3EThOG_qqrwX9Dm7HC9pEs04f_DmU1 — 200 — 2.6 KiB — 110 ms — http/1.1https://nuget.org/Content/gallery/img/book-open-icon.svg/Content/gallery/img/book-open-icon... https://nuget.org/Content/gallery/img/book-open-icon.svg — 301 — 352 B — 125 ms — http/1.1https://nuget.org/Content/gallery/img/search-icon.svg/Content/gallery/img/search-icon.sv... https://nuget.org/Content/gallery/img/search-icon.svg — 301 — 349 B — 135 ms — http/1.1https://nuget.org/Content/gallery/img/rocket-icon.svg/Content/gallery/img/rocket-icon.sv... https://nuget.org/Content/gallery/img/rocket-icon.svg — 301 — 349 B — 213 ms — http/1.1https://www.nuget.org/Content/gallery/img/nuget-lockup-dark-fill.svgwww.nuget.org/Content/gallery/img/n... https://www.nuget.org/Content/gallery/img/nuget-lockup-dark-fill.svg — 200 — 4.2 KiB — 208 ms — http/1.1https://www.nuget.org/Content/gallery/img/circuit-board-light-theme.svgwww.nuget.org/Content/gallery/img/c... https://www.nuget.org/Content/gallery/img/circuit-board-light-theme.svg — 200 — 25.3 KiB — 311 ms — http/1.1https://res-1.cdn.office.net/files/fabric-cdn-prod_20221201.001/assets/icons/fabricmdl2icons-3.70.woffres-1.cdn.office.net/files/fabric-c... https://res-1.cdn.office.net/files/fabric-cdn-prod_20221201.001/assets/icons/fabricmdl2icons-3.70.woff — 200 — 193.9 KiB — 29 ms — h2https://www.nuget.org/Content/gallery/img/book-open-icon.svgwww.nuget.org/Content/gallery/img/b... https://www.nuget.org/Content/gallery/img/book-open-icon.svg — 200 — 2.3 KiB — 108 ms — http/1.1https://www.nuget.org/Content/gallery/img/search-icon.svgwww.nuget.org/Content/gallery/img/s... https://www.nuget.org/Content/gallery/img/search-icon.svg — 200 — 2.1 KiB — 124 ms — http/1.1https://www.nuget.org/Content/gallery/img/rocket-icon.svgwww.nuget.org/Content/gallery/img/r... https://www.nuget.org/Content/gallery/img/rocket-icon.svg — 200 — 2.9 KiB — 116 ms — http/1.1https://www.nuget.org/stats/totalswww.nuget.org/stats/totals https://www.nuget.org/stats/totals — 200 — 1.7 KiB — 110 ms — http/1.1https://www.nuget.org/favicon.icowww.nuget.org/favicon.ico https://www.nuget.org/favicon.ico — 200 — 16.2 KiB — 205 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 392ms · 103KB · $5/mo
www.nuget.org
Other
Optional
Execution 164ms
Transfer 5 KB
Monthly Cost $2/mo
www.nuget.org
Other
Optional
Execution 148ms
Transfer 98 KB
Unused 64%
Monthly Cost $2/mo
Unattributable
Other
Optional
Execution 80ms
Transfer 0 KB
Monthly Cost $1/mo

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

64% of www.nuget.org'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.

Send Feedback