JavaScript libraries; Performance
Who left LazySizes, and who still runs it
53,809 websites in the top 1M run LazySizes, observed directly from the rendered page in the July 2026 crawl.
10,549
stopped running it that month
658
of those are 11–500 employees
14,161
adopted it in the last year
Confirmed across two consecutive crawls, not a single month. Build the list →
Some companies running LazySizes
Every row in a full list carries the prospect's whole detected stack.
Not currently available as a list.
What else they run
Open Graph 86%jQuery 85%Google Analytics 79%Cloudflare 73%core-js 70%Google Tag Manager 57%Google Font API 55%HSTS 54%HTTP/3 54%Priority Hints 52%
Share of a 3,000-domain sample of LazySizes users that also run each.