Skip to content
https://www.postman.com

Performance

· 14 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
75
GRADE
C
FIX
4
REVIEW
2
PASS
6
INFO
2

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

Mobile Desktop
73
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
92
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.
100
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.

683 ms

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

1.68 s

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

239 ms

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

0.154

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

2.29 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.

2.95 s

Page Load Progression

1.9 s
3.8 s
5.7 s
7.6 s
9.5 s
11.4 s
13.4 s
15.3 s
Checks
14
6 PASS 2 REVIEW 4 FIX
F
Page Weight Budget
Action
15.2 MB transferred, 238 requests
FIX
15.2 MB transferred, 238 requests
Critical::
Page weighs 19.6 MB (15.2 MB transferred)
Warning::
JavaScript is 1.1 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.1 MB
Info::
Fonts are 306 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 306 KB
Warning::
238 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 3.2 g CO2 per page load
15.2 MB / 2.4 MB budget
15.2 MB transferred
238 requests
3.2 g CO2 per page load
Other 12.4 MiB 82%
JavaScript 1.1 MiB 7%
Images 676.4 KiB 4%
Other 623.9 KiB 4%
Fonts 305.8 KiB 2%
Other 73.7 KiB 0%
CSS 73.1 KiB 0%
HTML 19.8 KiB 0%
Other 8.7 KiB 0%
Other 218 B 0%
0 2.4 MB 4.9 MB
Over 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

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
87% third-party, 0 ms blocking
FIX
87% third-party, 0 ms blocking
Warning::
Third-party code accounts for 87% of page weight (13.3 MiB of 15.2 MiB)
Info::
Third-party blocking time is low (0 ms)
87%
First-party Third-party
F
JS Execution Cost
Action
3797ms total JS execution
FIX
3797ms total JS execution
Warning::
https://www.postman.com/: 1234ms CPU time
Warning::
https://www.postman.com/_mk-www-next/_next/static/...: 1123ms CPU time
Warning::
Unattributable: 1004ms CPU time
Info::
https://www.postman.com/_mk-www-next/_next/static/...: 237ms CPU time
Info::
https://www.postman.com/_mk-www-next/scripts/index...: 72ms CPU time
Info::
Third-party scripts: 1131ms (30% of total)

Main Thread Breakdown

Other 44% Script Evaluation 36% Style & Layout 14%
ScriptTotalScriptingParse/CompileParty
https://www.postman.com/1234ms7ms8ms1st
https://www.postman.com/_mk-www-next/_next/static/chunks/0vdsih5a69_f4.js1123ms773ms14ms1st
Unattributable1004ms230ms0ms3rd
https://www.postman.com/_mk-www-next/_next/static/chunks/0gszrb.tymn7g.js237ms168ms3ms1st
https://www.postman.com/_mk-www-next/scripts/index.js?8de21b007d8a7bb06c9a1dd39e9a8141a0e7300b-36072ms58ms2ms1st
https://transcend-cdn.com/cm/1f0cf102-c592-4eb4-834f-e07f2fe68ef1/ui.js64ms50ms14ms3rd
https://transcend-cdn.com/cm/1f0cf102-c592-4eb4-834f-e07f2fe68ef1/airgap.js63ms55ms6ms3rd
D
JS Bundles
Action
49 scripts, 311 KB unused
FIX
49 scripts, 311 KB unused
Warning::
https://www.postman.com/_mk-www-next/_next/static/...: 90 KB unused (96%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.postman.com/_mk-www-next/_next/static/...: 70 KB unused (40%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.postman.com/_mk-www-next/_next/static/...: 38 KB unused (100%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://transcend-cdn.com/cm/1f0cf102-c592-4eb4-83...: 37 KB unused (38%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.postman.com/_mk-www-next/_next/static/...: 27 KB unused (99%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 311 KB
311 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.postman.com/_mk-www-next/_next/static/chunks/0r_9m.yojazts.js97 KB90 KB (96%)✓1st
https://www.postman.com/_mk-www-next/_next/static/chunks/0vdsih5a69_f4.js178 KB70 KB (40%)✓1st
https://www.postman.com/_mk-www-next/_next/static/chunks/02b6pof6~5-r7.js41 KB38 KB (100%)✓1st
https://transcend-cdn.com/cm/1f0cf102-c592-4eb4-834f-e07f2fe68ef1/ui.js99 KB37 KB (38%)✓3rd
https://www.postman.com/_mk-www-next/_next/static/chunks/15uqpo55k~c~~.js31 KB27 KB (99%)✓1st
https://www.postman.com/_mk-www-next/_next/static/chunks/0na4itfnub6re.js31 KB27 KB (96%)✓1st
https://evs.cdp.postman.com/6C88CYC9Neo3CfCCSD2BHa/xae7HN2EeK3mLEpFypgqAS.min.js29 KB21 KB (76%)✓3rd
https://www.postman.com/_mk-www-next/_next/static/chunks/08.zoq-ygx7ke.js15 KB—✓1st
https://static.cloudflareinsights.com/beacon.min.js/v8c78df7c7c0f484497ecbca7046644da177152312451611 KB—✓3rd
https://www.postman.com/_mk-www-next/_next/static/chunks/086ubv3i~ifk1.js16 KB—✓1st

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
29 images, 0 KB saveable
REVIEW
29 images, 0 KB saveable
Info::
All images are well-optimized
29 images 676 KB
0 oversized -0 KB
29 legacy format
0 missing dimensions CLS risk
B
HTTP Caching
public, max-age=0, must-revalidate
REVIEW
public, max-age=0, must-revalidate
Info::
Cache-Control header is set
Got: public, max-age=0, must-revalidate
Info::
Last-Modified header present
Cache-Control

public, max-age=0, must-revalidate

DirectiveValueMeaning
public—Any cache may store this response
max-age0Cache for 0 seconds
must-revalidate—Must recheck with server after expiry
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
5 fonts (306 KB)
PASS
5 fonts (306 KB)
Info::
5 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

5

306 KB total

Render-blocking

0

of 5

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 FCP 683 ms LCP 1.7 shttps://www.postman.com/_mk-www-next/_next/static/media/DegularDisplay_Bold-s.p.0.8gihflzlezh.woff2DegularDisplay_Bold-s.p... https://www.postman.com/_mk-www-next/_next/static/media/DegularDisplay_Bold-s.p.0.8gihflzlezh.woff2 — 38.2 KiB — 0 ms — font-display: swaphttps://www.postman.com/_mk-www-next/_next/static/media/Degular_Display_Semibold-s.p.07b.ew7x_s9q2.woff2Degular_Display_Semibol... https://www.postman.com/_mk-www-next/_next/static/media/Degular_Display_Semibold-s.p.07b.ew7x_s9q2.woff2 — 41.1 KiB — 0 ms — font-display: swaphttps://www.postman.com/_mk-www-next/_next/static/media/Inter_Regular-s.p.0otbhc.o2q64..woff2Inter_Regular-s.p.0otbh... https://www.postman.com/_mk-www-next/_next/static/media/Inter_Regular-s.p.0otbhc.o2q64..woff2 — 99.8 KiB — 0 ms — font-display: swaphttps://www.postman.com/_mk-www-next/_next/static/media/Inter_SemiBold-s.p.03g49jmofyg85.woff2Inter_SemiBold-s.p.03g4... https://www.postman.com/_mk-www-next/_next/static/media/Inter_SemiBold-s.p.03g49jmofyg85.woff2 — 110.2 KiB — 0 ms — font-display: swaphttps://www.postman.com/_mk-www-next/_next/static/media/ibm_plex_mono_v7_latin_regular-s.p.0k.c_-aqm~3z0.woff2ibm_plex_mono_v7_latin_... https://www.postman.com/_mk-www-next/_next/static/media/ibm_plex_mono_v7_latin_regular-s.p.0k.c_-aqm~3z0.woff2 — 16.5 KiB — 0 ms — font-display: swap
DegularDisplay_Bold-s.p... woff2 swap
Size 38 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
Degular_Display_Semibol... woff2 swap
Size 41 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
Inter_Regular-s.p.0otbh... woff2 swap
Size 100 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
Inter_SemiBold-s.p.03g4... woff2 swap
Size 110 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
ibm_plex_mono_v7_latin_... woff2 swap
Size 17 KB
Load time 0 ms
Start 0 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)

Fixing the unchecked items could save ~55 KB and ~110 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+
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
238 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
30% of JavaScript execution is third-party
First-party Third-party 1131ms · 154KB · €12/mo
Unattributable
Other
Costly
Execution 1004ms
Transfer 0 KB
Monthly Cost €11/mo
transcend-cdn.com
Other
Optional
Execution 64ms
Transfer 99 KB
Unused 38%
Monthly Cost €1/mo
transcend-cdn.com
Other
Optional
Execution 63ms
Transfer 55 KB
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • Unattributable adds 1004ms and costs ~€11/month

Unattributable takes 1004ms 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.

Send Feedback