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Performance

· 14 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
66
GRADE
D
FIX
4
REVIEW
3
PASS
5
INFO
2

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

Mobile Desktop
26
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
94
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
77
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.

5.78 s

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

27.76 s

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

6.92 s

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

0.036

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

15.22 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.

45.25 s

Page Load Progression

637 ms
1.3 s
1.9 s
2.5 s
3.2 s
3.8 s
4.5 s
5.1 s
Checks
14
5 PASS 3 REVIEW 4 FIX
F
Page Weight Budget
Action
12.6 MB transferred, 299 requests
FIX
12.6 MB transferred, 299 requests
Critical::
Page weighs 23.0 MB (12.6 MB transferred)
Warning::
Images are 4.9 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 4.9 MB
Warning::
JavaScript is 3.2 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 3.2 MB
Info::
Fonts are 497 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 497 KB
Warning::
299 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 2.6 g CO2 per page load
12.6 MB / 2.4 MB budget
12.6 MB transferred
299 requests
2.6 g CO2 per page load
Images 4.9 MiB 39%
JavaScript 3.2 MiB 25%
Other 2.9 MiB 23%
Other 937.2 KiB 7%
Fonts 497.5 KiB 4%
HTML 92.1 KiB 1%
Other 51.3 KiB 0%
CSS 10.6 KiB 0%
Other 7.0 KiB 0%
Other 2.0 KiB 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Over budget

Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.

Why this matters

Image bandwidth is high — modern formats (WebP/AVIF) and resizing typically cut it 50%+.

Source: web.dev

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

Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.

Why this matters

High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.

Source: web.dev

D
Third-Party Impact
Action
92% third-party, 0 ms blocking
FIX
92% third-party, 0 ms blocking
Warning::
Third-party code accounts for 92% of page weight (11.5 MiB of 12.6 MiB)
Info::
Third-party blocking time is low (0 ms)
92%
First-party Third-party
F
JS Execution Cost
Action
21529ms total JS execution
FIX
21529ms total JS execution
Warning::
Unattributable: 5051ms CPU time
Warning::
https://www.mongodb.com/_next/static/chunks/framew...: 3307ms CPU time
Warning::
https://cdn.optimizely.com/js/5557007785132032.js: 1834ms CPU time
Warning::
https://webassets.mongodb.com/_com_assets/cms/mlto...: 1734ms CPU time
Warning::
https://cdn.segment.com/next-integrations/integrat...: 1319ms CPU time
Warning::
Third-party scripts: 15683ms (73% of total)

Main Thread Breakdown

Script Evaluation 61% Other 23% Script Parsing & Compilation 7% Style & Layout 5%
ScriptTotalScriptingParse/CompileParty
Unattributable5051ms454ms0ms3rd
https://www.mongodb.com/_next/static/chunks/framework-7586a95b0478321d.js3307ms2917ms17ms1st
https://cdn.optimizely.com/js/5557007785132032.js1834ms1206ms285ms3rd
https://webassets.mongodb.com/_com_assets/cms/mltoya8eg17hc511u-chatbot-19-02-2026.js1734ms1327ms259ms3rd
https://cdn.segment.com/next-integrations/integrations/vendor/commons.59560acdd69ed701c941.js.gz1319ms1252ms10ms3rd
https://pathway.mongodb.com/962ms876ms23ms3rd
https://euob.michiganrobotflower.com/sxp/i/1026a1528f8727653fd96984e7b20597.js835ms661ms25ms3rd
https://unpkg.com/@rive-app/canvas785ms661ms39ms3rd
https://www.mongodb.com/_next/static/chunks/pages/%5B%5B...page%5D%5D-887415a1fed2449c.js758ms752ms3ms1st
https://www.mongodb.com/693ms35ms1ms1st

Showing top 10 of 32 scripts

F
JS Bundles
Action
72 scripts, 1.6 MB unused
FIX
72 scripts, 1.6 MB unused
Warning::
https://cdn.optimizely.com/js/5557007785132032.js: 383 KB unused (73%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://webassets.mongodb.com/_com_assets/cms/mlto...: 298 KB unused (58%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.mongodb.com/_next/static/chunks/9732e8...: 261 KB unused (62%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-GDF...: 111 KB unused (64%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.mongodb.com/_next/static/chunks/642-ba...: 101 KB unused (67%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 1.6 MB
1632 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://cdn.optimizely.com/js/5557007785132032.js530 KB383 KB (73%)✓3rd
https://webassets.mongodb.com/_com_assets/cms/mltoya8eg17hc511u-chatbot-19-02-2026.js512 KB298 KB (58%)✓3rd
https://www.mongodb.com/_next/static/chunks/9732e8d6-75ce682f5f0e8aa1.js422 KB261 KB (62%)✓1st
https://www.googletagmanager.com/gtm.js?id=GTM-GDFN&l=dataLayer172 KB111 KB (64%)✓3rd
https://www.mongodb.com/_next/static/chunks/642-baeee0de09929e75.js151 KB101 KB (67%)✓1st
https://www.mongodb.com/_next/static/chunks/ec740807-1e79f3a47a2862cc.js130 KB80 KB (62%)✓1st
https://www.mongodb.com/_next/static/chunks/pages/_app-223717bf473eb0c8.js95 KB74 KB (78%)✓1st
https://www.googletagmanager.com/gtm.js?id=GTM-GDFN172 KB69 KB (40%)✓3rd
https://www.mongodb.com/_next/static/chunks/9a8bd14d-71540a3865856829.js56 KB55 KB (100%)✓1st
https://cdn.cookielaw.org/scripttemplates/202401.1.0/otBannerSdk.js104 KB53 KB (51%)✓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

B
Image Optimization
118 images, 0 KB saveable
REVIEW
118 images, 0 KB saveable
Info::
All images are well-optimized
118 images 4.9 MB
0 oversized -0 KB
114 legacy format
0 missing dimensions CLS risk
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

B
HTTP Caching
s-maxage=30, stale-while-revalidate
REVIEW
s-maxage=30, stale-while-revalidate
Info::
Cache-Control header is set
Got: s-maxage=30, stale-while-revalidate
Info::
CDN TTL: 30 seconds (s-maxage=30)
Info::
ETag present — enables conditional (304) responses
Cache-Control

s-maxage=30, stale-while-revalidate

DirectiveValueMeaning
s-maxage30CDN caches for 30 seconds
stale-while-revalidate—Serve stale while revalidating
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
9 fonts (497 KB)
PASS
9 fonts (497 KB)
Info::
9 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

9

497 KB total

Render-blocking

0

of 9

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s 18.0 s 20.0 s 22.0 s 24.0 s 26.0 s 28.0 s FCP 5.8 s LCP 27.8 shttps://static.mongodb.com/com/fonts/akzidenzgroteskbq_light-webfont.woff2akzidenzgroteskbq_light... https://static.mongodb.com/com/fonts/akzidenzgroteskbq_light-webfont.woff2 — 25.2 KiB — 0 ms — font-display: swaphttps://static.mongodb.com/com/fonts/akzidenzgroteskbq_medium-webfont.woff2akzidenzgroteskbq_mediu... https://static.mongodb.com/com/fonts/akzidenzgroteskbq_medium-webfont.woff2 — 24.4 KiB — 0 ms — font-display: swaphttps://static.mongodb.com/com/fonts/EuclidCircularA-Regular-WebXL.woff2EuclidCircularA-Regular... https://static.mongodb.com/com/fonts/EuclidCircularA-Regular-WebXL.woff2 — 44.6 KiB — 0 ms — font-display: swaphttps://static.mongodb.com/com/fonts/EuclidCircularA-Medium-WebXL.woff2EuclidCircularA-Medium-... https://static.mongodb.com/com/fonts/EuclidCircularA-Medium-WebXL.woff2 — 44.9 KiB — 0 ms — font-display: swaphttps://static.mongodb.com/com/fonts/MongoDBValueSerif-Regular.woff2MongoDBValueSerif-Regul... https://static.mongodb.com/com/fonts/MongoDBValueSerif-Regular.woff2 — 45.7 KiB — 0 ms — font-display: swaphttps://static.mongodb.com/com/fonts/MongoDBValueSerif-Medium.woff2MongoDBValueSerif-Mediu... https://static.mongodb.com/com/fonts/MongoDBValueSerif-Medium.woff2 — 46.6 KiB — 0 ms — font-display: swaphttps://static.mongodb.com/com/fonts/MongoDBValueSerif-Bold.woff2MongoDBValueSerif-Bold.... https://static.mongodb.com/com/fonts/MongoDBValueSerif-Bold.woff2 — 46.0 KiB — 0 ms — font-display: swaphttps://static.mongodb.com/com/fonts/SourceCodePro-Regular.ttfSourceCodePro-Regular.ttf https://static.mongodb.com/com/fonts/SourceCodePro-Regular.ttf — 102.0 KiB — 0 ms — font-display: swaphttps://static.mongodb.com/com/fonts/SourceCodePro-Medium.ttfSourceCodePro-Medium.ttf https://static.mongodb.com/com/fonts/SourceCodePro-Medium.ttf — 118.0 KiB — 0 ms — font-display: swap
akzidenzgroteskbq_light... woff2 swap
Size 25 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
akzidenzgroteskbq_mediu... woff2 swap
Size 24 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
EuclidCircularA-Regular... woff2 swap
Size 45 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
EuclidCircularA-Medium-... woff2 swap
Size 45 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
MongoDBValueSerif-Regul... woff2 swap
Size 46 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
MongoDBValueSerif-Mediu... woff2 swap
Size 47 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
MongoDBValueSerif-Bold.... woff2 swap
Size 46 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
SourceCodePro-Regular.ttf ttf swap
Size 102 KB
Load time 0 ms
Start 0 ms
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
SourceCodePro-Medium.ttf ttf swap
Size 118 KB
Load time 0 ms
Start 0 ms
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 ~176 KB and ~352 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
299 requests over 0ms
INFO

Performance analysis not available for this result.

Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
73% of JavaScript execution is third-party
First-party Third-party 15683ms · 2114KB · $294/mo
Unattributable
Other
Costly
Execution 5051ms
Transfer 0 KB
Monthly Cost $95/mo
Optimizely
A/B Testing
Costly
Execution 1834ms
Transfer 530 KB
Unused 73%
Monthly Cost $34/mo
webassets.mongodb.com
Other
Costly
Execution 1734ms
Transfer 512 KB
Unused 58%
Monthly Cost $33/mo
Segment
Analytics
Costly
Execution 1319ms
Transfer 22 KB
Monthly Cost $25/mo
pathway.mongodb.com
Other
Costly
Execution 962ms
Transfer 107 KB
Unused 25%
Monthly Cost $18/mo
euob.michiganrobotflower.com
Other
Costly
Execution 835ms
Transfer 45 KB
Monthly Cost $16/mo
unpkg
CDN
Costly
Execution 785ms
Transfer 0 KB
Monthly Cost $15/mo
Google Tag Manager
Tag Manager
Costly
Execution 581ms
Transfer 172 KB
Unused 40%
Monthly Cost $11/mo
obseu.michiganrobotflower.com
Other
Costly
Execution 478ms
Transfer 2 KB
Monthly Cost $9/mo
OneTrust
Consent
Essential
Execution 381ms
Transfer 104 KB
Unused 51%
Monthly Cost $7/mo
Hotjar
Session Replay
Costly
Execution 236ms
Transfer 57 KB
Unused 67%
Monthly Cost $4/mo
LinkedIn Insight
Advertising
Costly
Execution 216ms
Transfer 0 KB
Monthly Cost $4/mo
Facebook Pixel
Advertising
Costly
Execution 201ms
Transfer 95 KB
Unused 33%
Monthly Cost $4/mo
Bing UET
Advertising
Optional
Execution 175ms
Transfer 15 KB
Monthly Cost $3/mo
Google Tag Manager
Tag Manager
Optional
Execution 137ms
Transfer 145 KB
Unused 35%
Monthly Cost $3/mo
tr.capterra.com
Other
Optional
Execution 131ms
Transfer 26 KB
Monthly Cost $2/mo
s.dpmsrv.com
Other
Optional
Execution 109ms
Transfer 12 KB
Monthly Cost $2/mo
Google Tag Manager
Tag Manager
Optional
Execution 102ms
Transfer 172 KB
Unused 64%
Monthly Cost $2/mo
www.mongodb.com
Other
Optional
Execution 94ms
Transfer 0 KB
Monthly Cost $2/mo
Facebook Pixel
Advertising
Optional
Execution 83ms
Transfer 37 KB
Monthly Cost $2/mo
evs.blue.mongodb.com
Other
Optional
Execution 67ms
Transfer 30 KB
Monthly Cost $1/mo
OneTrust
Consent
Essential
Execution 63ms
Transfer 9 KB
Monthly Cost $1/mo
Segment
Analytics
Optional
Execution 59ms
Transfer 1 KB
Monthly Cost $1/mo
www.redditstatic.com
Other
Optional
Execution 51ms
Transfer 19 KB
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • Unattributable adds 5051ms and costs ~$95/month
  • Optimizely adds 1834ms and costs ~$34/month
  • webassets.mongodb.com adds 1734ms and costs ~$33/month
  • Segment adds 1319ms and costs ~$25/month
  • pathway.mongodb.com adds 962ms and costs ~$18/month
  • euob.michiganrobotflower.com adds 835ms and costs ~$16/month
  • unpkg adds 785ms and costs ~$15/month
  • Google Tag Manager adds 581ms and costs ~$11/month
  • obseu.michiganrobotflower.com adds 478ms and costs ~$9/month
  • Hotjar adds 236ms and costs ~$4/month
  • LinkedIn Insight adds 216ms and costs ~$4/month
  • Facebook Pixel adds 201ms and costs ~$4/month

73% 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 5051ms 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

Optimizely takes 1834ms 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

73% of Optimizely'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

webassets.mongodb.com takes 1734ms 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

58% of webassets.mongodb.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

Segment takes 1319ms 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

pathway.mongodb.com takes 962ms 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

euob.michiganrobotflower.com takes 835ms 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

unpkg takes 785ms 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

Google Tag Manager takes 581ms 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

obseu.michiganrobotflower.com takes 478ms 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

51% of OneTrust'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

Hotjar takes 236ms 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

67% of Hotjar'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

LinkedIn Insight takes 216ms 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

Facebook Pixel takes 201ms 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

64% of Google Tag Manager'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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