Web Almanac 2025: median mobile page weight crossed 2,559 KB in July 2025 (+7.8% YoY)
Claim: Median mobile home-page weight reached 2,559 KB in July 2025; desktop 2,862 KB. That's +7.8% YoY. Average mobile Total Blocking Time: 1,916 ms — almost 10× the 200ms best-practice target.
Source: HTTP Archive Web Almanac 2025 (Page Weight + Performance chapters); also cited via corewebvitals.io.
Confidence: Verified.
The compounding tax framing: the average page is getting heavier, not lighter. Every plugin update adds asset, every embed adds bytes, every "modernization" adds JS. The race is being lost across the average web; the moat for disciplined teams widens. A site that defends a 1.0 MB budget today is materially differentiated from the median 2.56 MB site, and the gap will be wider in 2027. See Reference: 2026 performance budget — SMB marketing site (Candid default targets) for the budget framework.
Related
Referenced by (3)
- reference Reference: 2026 performance budget — SMB marketing site (Candid default targets) depends-on
- rule RULE: Performance budgets enforced in CI. Build fails on budget violation. Documented budgets without CI enforcement do not work. depends-on
- reference Research brief: Page Speed as a Moat — why CWV separates the agencies from the freelancers (piece 9 of 15) relates-to