Python Core Web Vitals
How real Chrome users experience www.python.org, from Google's Chrome UX Report: the 75th percentile of visits on every device.
Python passes Core Web Vitals
Sep 25 – Oct 22, all devices
INP
23 ms
Good
LCP
909 ms
Good
CLS
0.03
Good
FCP
651 ms
Good
TTFB
268 ms
Good
INP over time
Weekly p75. The dashed line is the 200 ms "good" threshold.
What the numbers say
- Python passes Core Web Vitals: LCP 909 ms, CLS 0.03, INP 23 ms are all in Google's "good" range for 3 in 4 visits.
- Among 23 frameworks and docs sites we track, Python has the 3rd fastest LCP.
- INP has held steady around 24 ms over the last 25 weeks.
Keep a site like this from getting slower
Real-user data shows a regression weeks after it ships. Vitalgate runs Lighthouse on every pull request and fails the check when a change breaks budgets like these: LCP ≤ 2.5 s, CLS ≤ 0.10, FCP ≤ 1.8 s.
Other frameworks and docs sites
| Site | Core Web Vitals | LCP | INP | CLS |
|---|---|---|---|---|
| React | Passes | 1.2 s | 78 ms | 0.00 |
| Next.js | Passes | 1.2 s | 85 ms | 0.00 |
| Vue | Fails | 1.3 s | 64 ms | 0.11 |
| Svelte | Passes | 878 ms | 55 ms | 0.00 |
| Astro | Passes | 983 ms | 35 ms | 0.00 |
| Nuxt | Passes | 1.5 s | 129 ms | 0.02 |
| Angular | Passes | 1.5 s | 78 ms | 0.06 |
| Remix | Passes | 1.4 s | 124 ms | 0.00 |
| Vite | Passes | 1.3 s | 67 ms | 0.04 |
| Tailwind CSS | Passes | 1.3 s | 73 ms | 0.00 |
| TypeScript | Passes | 1.5 s | 60 ms | 0.05 |
| MDN | Passes | 1.0 s | 52 ms | 0.01 |
| web.dev | Fails | 2.7 s | 134 ms | 0.09 |
| Node.js | Passes | 1.1 s | 115 ms | 0.01 |
| Deno | Passes | 2.0 s | 63 ms | 0.00 |
| Bun | Passes | 1.3 s | 95 ms | 0.01 |
| Django | Passes | 1.2 s | 37 ms | 0.00 |
| Laravel | Passes | 2.3 s | 135 ms | 0.01 |
| Ruby on Rails | Passes | 786 ms | 45 ms | 0.03 |
| Go | Passes | 1.6 s | 45 ms | 0.02 |
| TanStack | Fails | 2.7 s | 176 ms | 0.01 |
| shadcn/ui | Passes | 1.0 s | 171 ms | 0.00 |