speedlify2

Lighthouse lab metrics, Axe, and Chrome UX Report field data for a list of sites recorded and compared over time. Follow us on Mastodon or Bluesky.

Charts Compare Measurement runs Embed a score Open to Work

bolt.new

https://bolt.new/

29PERF 91A11Y 73BEST 100SEO ✗AXE ✗CWV

Ranks Overall #1,800 Developer Tooling #94 AI #12

Data from Oct 16, 2026, 10:57 AM UTC old Measured every 2 days · 21 runs since Aug 31, 2026

Elsewhere: PageSpeed Insights · Calibre · Treo · CrUX Vis · Tame the Bots · Scoring Calculator · Wayback Machine

Lab data is measured using Lighthouse, Mobile mode unless otherwise specified. Field data is reported from Chrome UX Report (using p75 measurements).

Stack

React Router Built with React Router
Uses ReactReact
Cloudflare Hosted by Cloudflare

Filmstrip LAB Throttled

How the page drew during the measured load, at 9 points across 44.99 s. Compare this filmstrip against another site.

  1. 5.62 s
  2. 11.25 s
  3. 15.67 s
  4. 17.46 s
  5. 22.49 s
  6. 28.12 s
  7. 33.74 s
  8. 39.36 s
  9. 44.99 s

Lighthouse Scores LAB Simulated

29
Performance
↑ +2 (+7.4%)
91
Accessibility
no change
73
Best Practices
no change
100
SEO
no change

Metrics LAB FIELD

Core Web Vitals: failing 3 of 3 assessed from real Chrome users.

Field figures are the p75 across real Chrome users over a 28-day trailing window (2026-09-17 → 2026-10-14), url-level.

Metric Lab Simulated Field
Value Change / range Trend p75 Distribution
LCP CWV Largest Contentful Paint 32.24 s poor ↑ +7399 ms (+29.8%) 16.35 s – 34.79 s 4.73 s poor 37.1% 30.5% 32.4%
INP CWV Interaction to Next Paint — field only, no lab run can measure it n/a — 864 ms poor 16.3% 36.2% 47.6%
CLS CWV Cumulative Layout Shift 0 good → no change 0 – 0.011 0.020 good 91.7% 6% 2.3%
TBT Total Blocking Time 1.56 s poor ↓ -723 ms (-31.7%) 1.10 s – 2.59 s n/a —
FCP First Contentful Paint 17.37 s poor ↑ +184 ms (+1.1%) 11.42 s – 17.89 s 4.11 s poor 25.1% 33.5% 41.4%
Speed Index 17.37 s poor ↑ +184 ms (+1.1%) 11.42 s – 17.89 s n/a —
TTFB Time to First Byte 678 ms good ↑ +20 ms (+3%) 651 ms – 731 ms 2.21 s poor 29% 33.5% 37.5%

LCP Subparts LAB Throttled

The subparts attribute LCP to your server, resource discovery, download, or rendering. They come from one throttled load, the same one as the filmstrip, so they add up to that load’s LCP rather than the simulated Lab LCP above.

resource load delay 14.65 s
resource load duration 2.02 s
time to first byte 762 ms
element render delay 32 ms

LCP LAB Simulated vs LCP FIELD

Lab 32.24 s
Field p75 4.73 s

The lab LCP is 6.81× the field p75 — real users likely have above-average hardware or network connectivity.

Page weight

Metric Value Change / range Trend
Page Weight 5.39 MB ↑ +62.2 kB (+1.2%) 5.21 MB – 5.58 MB
Requests 467 ↑ +4 (+0.9%) 397 – 474
Third-party Weight 1.93 MB ↑ +26.8 kB (+1.4%) 1.68 MB – 2.11 MB
Third-party CPU 420 ms ↓ -166 ms (-28.3%) significant 359 ms – 586 ms
Unused JS 1.85 MB ↑ +41.5 kB (+2.4%) 1.71 MB – 1.85 MB
Unused CSS 104 kB ↑ +152 B (+0.1%) 0 B – 104 kB

By resource type

Type Transfer Share Size Requests
script 85.5% 4.61 MB 330
image 5.7% 309 kB 31
font 5.2% 280 kB 4
stylesheet 2.6% 143 kB 16
document 0.5% 27.6 kB 1
other 0.4% 20.2 kB 42
Total 5.39 MB 467

Third parties 24 entities

Entity Transfer Size Main thread Simulated
Google Tag Manager script 776 kB 165 ms
Facebook script 220 kB 107 ms
TikTok script 164 kB 39 ms
cello.so script 142 kB 2 ms
staticblitz.com script 141 kB 17 ms
All 24 1.93 MB 420 ms

Without JavaScript

The same load, photographed twice at 412×823: once with scripts disabled, once as rendered.

Scripts disabled
As rendered

0.2% of pixels differ — they are nearly identical. A shifted layout counts as difference, so a <noscript> banner alone can account for a large figure.

Page health

Metric Value Change / range Trend
Main Thread Work 10.20 s ↓ -3934 ms (-27.8%) significant 10.20 s – 25.67 s
Long Tasks 20 → no change 20 – 20
DOM Elements 792 ↓ -4 (-0.5%) 759 – 961
Axe Violations Violating nodes from a full Axe CLI run (more than Lighthouse reports) 25 ↓ -1 (-3.8%) 17 – 26
A11y Failures 3 → no change 3 – 3
A11y Failing Nodes 7 → no change 3 – 7

Main thread work

Task Time Share Duration Simulated
script evaluation 58% 5.86 s
other 22% 2.25 s
style layout 12% 1.19 s
script parse compile 4% 400 ms
garbage collection 2% 201 ms
paint composite render 2% 156 ms
parse HTML 1% 134 ms
Total 10.20 s

Axe violations axe-core 4.13.0, full rule set

25 violating nodes across 4 rules, 770 passing. This is a standalone Axe CLI run and is stricter than the subset Lighthouse already includes.

  • moderate region — All page content should be contained by landmarks 18 nodes
    Offending elements (5 of 18)
    1. .my-auto > .w-full.flex-col.relative:nth-child(1) 
      <div class="relative flex w-full flex-col items-center">
    2. .z-20 > .px-\[var\(--chat-padding\)\].z-prompt.max-w-2xl > div:nth-child(1) > .relative:nth-child(3) > .overflow-clip.rounded-3xl.shadow-\[0_0_40px_-12px_rgba\(0\,0\,0\,0\.35\)\] > div:nth-child(3) > div > div > ._ComposerLayer_15ayx_1 > ._EditorContent_15ayx_5 
      <div class="_EditorContent_15ayx_5">
    3. .sm\:flex-none 
      <p class="flex-1 sm:flex-none text-center text-bolt-ds-textSecondary">or start from</p>
    4. .sr-only 
      <span class="sr-only">Trusted by Google, Microsoft, Salesforce, AWS, Meta, HubSpot, Accenture, TikTok, Shopify, Chegg, Cloudflare, Netlify, FactSet, ByteDance, PwC, Mozilla, Intel, Xano, Stripe</span>
    5. .mb-12 
      <div class="text-center mb-12 sm:mb-16 lg:mb-20">
  • serious color-contrast — Elements must meet minimum color contrast ratio thresholds 5 nodes
    Offending elements
    1. .-right-1\.5 
      <span class="absolute -right-1.5 -top-1.5 z-10 rounded-full bg-bolt-ds-brand px-1.5 py-0.5 text-[10px] font-medium leading-none text-bolt-ds-onBrand">New</span>
    2. .site-footer-col:nth-child(1) > .site-footer-label 
      <p class="site-footer-label">Solutions</p>
    3. .site-footer-col:nth-child(2) > .site-footer-label 
      <p class="site-footer-label">Resources</p>
    4. .site-footer-col:nth-child(3) > .site-footer-label 
      <p class="site-footer-label">More</p>
    5. .site-footer-col--connect > .site-footer-label 
      <p class="site-footer-label">Connect</p>
  • serious aria-hidden-focus — ARIA hidden element must not be focusable or contain focusable elements 1 node
    Offending element
    1. .fixed 
      <div data-testid="mobile-preview-overlay" data-open="false" aria-hidden="true" class="fixed flex flex-col bg-bolt-ds-bgSecondary left-0 top-0 size-px overflow-hidden opacity-0 pointer-events-none -z-…
  • moderate landmark-one-main — Document should have one main landmark 1 node
    Offending element
    1. html 
      <html lang="en" data-theme="dark" data-theme-option="dark" style="--computed-prompt-surface-height: 137px; --computed-prompt-box-height: 137px;" data-hydrated="true">

Accessibility failures 3 of 27 audits

  • color-contrast — Background and foreground colors do not have a sufficient contrast ratio. 5 nodes
  • aria-hidden-focus — `[aria-hidden="true"]` elements contain focusable descendents 1 node
  • landmark-one-main — Document does not have a main landmark. 1 node

Best Practices failures 4 of 19 audits

  • third-party-cookies — Uses third-party cookies 31 items
  • errors-in-console — Browser errors were logged to the console 3 items
  • inspector-issues — Issues were logged in the `Issues` panel in Chrome Devtools 1 item
  • valid-source-maps — Missing source maps for large first-party JavaScript 281 items

Hygiene

HTTPS HSTS CSP Clickjacking protection Origin isolation Trusted Types bfcache h2 3 console errors

Measurement log

Field history 25 weeks

Weekly p75 from the CrUX History API, backfilled in a single request.

Week ending LCPINPCLSFCPTTFB
2026-10-10 4.72 s 855 ms 0.020 4.08 s 2.23 s
2026-10-03 4.75 s 858 ms 0.020 4.14 s 2.31 s
2026-09-26 4.67 s 860 ms 0.020 4.08 s 2.31 s
2026-09-19 4.63 s 862 ms 0.020 4.05 s 2.29 s
2026-09-12 4.55 s 855 ms 0.010 3.96 s 2.24 s
2026-09-05 4.44 s 830 ms 0.010 3.84 s 2.19 s
2026-08-29 4.36 s 793 ms 0.010 3.77 s 2.16 s
2026-08-22 4.28 s 760 ms 0.010 3.69 s 2.13 s
2026-08-15 4.25 s 735 ms 0.010 3.66 s 2.11 s
2026-08-08 4.14 s 716 ms 0.010 3.56 s 2.04 s
2026-08-01 3.93 s 711 ms 0.010 3.38 s 1.88 s
2026-07-25 3.70 s 707 ms 0.010 3.22 s 1.73 s

Runs

Every stored run for this URL, newest first.

When Scores PerfLCPCLSTBTWeight RunsSpreadBenchTook Archive
Oct 16, 2026, 10:57 AM UTC 29 32.24 s 0 1.56 s 5.39 MB 3/3 ±1 3,187 +28% 242.9s Wayback
Oct 14, 2026, 5:52 AM UTC 27 24.84 s 0 2.28 s 5.32 MB 3/3 ±1 2,499 0% 266.5s Wayback
Oct 9, 2026, 3:00 AM UTC 26 16.35 s 0 2.57 s 5.48 MB 3/3 ±1 2,508 +1% 262.5s Wayback
Oct 7, 2026, 2:11 AM UTC 27 27.29 s 0 2.27 s 5.47 MB 3/3 ±1 2,413 -3% 256.5s Wayback
Oct 3, 2026, 8:57 PM UTC 27 28.13 s 0 2.04 s 5.58 MB 3/3 ±0 2,755 +11% 247.6s Wayback
Sep 30, 2026, 3:44 PM UTC 30 33.93 s 0 1.45 s 5.50 MB 3/3 ±1 3,039 +22% 245s Wayback
Sep 28, 2026, 10:43 AM UTC 27 20.51 s 0.011 2.37 s 5.44 MB 3/3 ±1 2,560 +3% 305.5s Wayback
Sep 25, 2026, 6:07 AM UTC 29 30.61 s 0 1.50 s 5.46 MB 3/3 ±1 3,165 +27% 245.5s Wayback
Sep 23, 2026, 5:32 AM UTC 26 18.06 s 0.011 2.55 s 5.42 MB 3/3 ±0 2,471 -1% 260s Wayback
Sep 21, 2026, 1:04 AM UTC 28 27.93 s 0 1.70 s 5.21 MB 3/3 ±0 2,410 -3% 255.6s Wayback
Sep 18, 2026, 1:37 PM UTC 30 32.96 s 0 1.34 s 5.41 MB 3/3 ±0 2,959 +19% 299.4s Wayback
Sep 16, 2026, 3:49 AM UTC 27 27.33 s 0 2.31 s 5.39 MB 3/3 ±1 2,476 0% 263.5s Wayback
Sep 14, 2026, 1:01 AM UTC 32 34.79 s 0 1.10 s 5.46 MB 3/3 ±1 4,042 +63% 242.8s Wayback
Sep 11, 2026, 8:56 PM UTC 27 20.34 s 0.011 2.35 s 5.40 MB 3/3 ±1 1,777 -29% 326.1s Wayback
Sep 9, 2026, 5:47 PM UTC 27 27.66 s 0 2.36 s 5.38 MB 3/3 ±4 2,478 0% 188.9s Wayback
Sep 7, 2026, 3:06 PM UTC 27 27.56 s 0 2.32 s 5.36 MB 3/3 ±0 2,330 -6% 290s Wayback
Sep 5, 2026, 12:26 PM UTC 27 27.96 s 0 2.29 s 5.34 MB 3/3 ±0 2,496 0% 190.9s Wayback
Sep 4, 2026, 1:09 AM UTC 29 19.89 s 0 1.54 s 5.31 MB 3/3 ±2 3,433 +38% 177s Wayback
Sep 2, 2026, 11:16 PM UTC 28 30.54 s 0 1.70 s 5.57 MB 3/3 ±1 2,675 +8% 184.7s Wayback
Sep 1, 2026, 10:42 PM UTC 27 28.48 s 0 2.16 s 5.30 MB 3/3 ±1 2,670 +7% 185.4s Wayback
Aug 31, 2026, 9:00 PM UTC 26 20.01 s 0.011 2.59 s 5.28 MB 3/3 ±0 2,481 0% 187.9s Wayback