66.5% of responses on the typical site are cacheable

LCP INP CLS

At a glance the headline numbers for Cacheable responses

The share of responses that carry cacheable headers.

66.5%

on the typical site

half of sites sit at or below

84.5%

1 in 4 sites exceed this

the top quarter

98.1%

the heaviest 1%

the long tail

94,910

sites measured

phone field data

66.5% of responses on the typical site are cacheable.

The State of Web Vitals · Q1 2026 · 94,910 sites · phone field datacorewebvitals.io/state-of-cwv

Distribution & median INP site count and median INP at each level of cacheable responses

0ms 63ms 125ms 188ms 250ms

200ms

0 9261 18521

0 0–10 10–20 20–30 30–40 40–50 50–60 60–70 70–80 80–90 90–100 100

Good (≤200ms) Needs improvement Poor (>500ms) Site count

The State of Web Vitals · Q1 2026 · 94,910 sites · phone field datacorewebvitals.io/state-of-cwv

Passing INP by cacheable responses which level passes the INP most often

Cacheable responsesSitesPassing INPINP

0 9,115 86% 95ms

0–10 10,556 93% 95ms

10–20 8,437 93% 96ms

20–30 4,946 93% 97ms

30–40 3,352 88% 103ms

40–50 2,809 86% 110ms

50–60 4,223 89% 108ms

60–70 7,001 90% 106ms

70–80 12,116 90% 106ms

80–90 18,521 95% 97ms

90–100 13,483 96% 94ms

100 351 97% 81ms

Good Needs Improvement Poor Faded rows: under 100 sites

Cacheable responses 66.5%. p75 84.5%. p99 98.1%. At the low end (0): INP 95ms. At the high end (100): INP 81ms. computed

The State of Web Vitals · Q1 2026 · 94,910 sites · phone field datacorewebvitals.io/state-of-cwv

Why this matters for the Core Web Vitals, and where to start fixing it

This is the share of responses a browser is allowed to keep. Everything outside that share gets re-downloaded on the next visit. Repeat visitors are in your field data too, and for them cacheability is the difference between reading from disk and crossing the network.

Uncacheable static assets are almost always an accident: a missing header on a font, a no-cache default on an image bucket. If a file has a hash in its name, there is no reason it should ever be fetched twice.

How does caching affect the Core Web Vitals?

Cacheable share correlates with the LCP. Where the cacheable share is low, 84% of sites pass the LCP. Where it is high, 96% do. The rise is gradual.

Go fix it TTFB: cache duration → Configure Cloudflare for passing the Core Web Vitals →

Related signals HTML compression → Cache strategy mix → HTTP protocol mix → HTTP protocol → Chrome field data from 94,910 sites, representing millions of real page loads · How we measured