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Ivan Akulov @iamakulov.com · 24/09/2026

@storyhb.com hey :) i’m a staff performance engineer at Framer. i have a quick q about automatic image preloading in React 19. (hopefully you’re the right person as you merged github.com/react/react/... – if not, sorry, just lmk who’s the best person to ask this at 🙏)

github.com

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Ivan Akulov @iamakulov.com · 22/09/2026

common but surprisingly rarely mentioned react perf pitfall: 1) text changes its size when fonts load (duh, you see this every day). often it gets larger 2) lcp (= google’s loading speed metric) scans for the largest element on the page. but it scans only newly added elements. it doesn’t scan--

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Ivan Akulov @iamakulov.com · 15/07/2026

Possibly one of the most impressive Safari bugs I’ve run into lately: Going back (with a swipe) in *any* React app that uses Navigation API freezes the page for three seconds. What’s fun is the main thread is not frozen, only the rendered page is.

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Ivan Akulov @iamakulov.com · 06/07/2026

TIL GTM has a History Change trigger, but this trigger doesn’t fire when you navigate via the new Navigation API :( There goes my dream of making all Framer sites use navigation.navigate() instead of history.pushState()

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mattzeunert.com @mattzeunert.com · 14/04/2026

If you throttle the network in DevTools you can't always trust the metrics. @iamakulov.com explains why in his new article. 3perf.com/blog/chrome-...

3perf.com

Chrome DevTools Throttling Is Not Accurate

Chrome DevTools slows down requests, not packets. This means its throttling is often off where it matters.

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Ivan Akulov @iamakulov.com · 14/04/2026

Doctor: Chrome DevTools throttling is real and can hurt you Chrome DevTools throttling: [proceeds to not be real]

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Mark Erikson @acemarke.dev · 19/03/2026

My Replay time-travel-based React+Redux perf reports experiments are coming together! Just nailed sourcemapped component + selector identities, and I've got accurate timing details on dispatches + renders from a Replay DevTools E2E recording! Early perf report example attached.

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Ivan Akulov @iamakulov.com · 27/03/2026

Something I worked on (with a few other wonderful folks) for the past few weeks :) www.framer.com/llm

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Ivan Akulov @iamakulov.com · 18/03/2026

the chart that I feel perhaps the proudest of is this framer’s lcp (aka page loading time), across all sites, going lower and lower day by day, free for all framer customers lots of work by our infra/canvas teams, @kurtextrem.de, and yours truly <3

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Ivan Akulov @iamakulov.com · 17/03/2026

next.js (pages router) loads data for pages you navigate to, but never releases it, whoops: github.com/vercel/next...

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Ivan Akulov @iamakulov.com · 17/03/2026

ah yes it’s my favorite “iphone safari wraps every phone number with <a> → react has a hydration mismatch → it remounts the full dom → all images on the page flash, but only on iphone” type of day

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Ivan Akulov @iamakulov.com · 23/02/2026

Tomorrow, when you publish a Framer site, every page’s HTML will get 10-20% smaller:

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Ivan Akulov @iamakulov.com · 14/02/2026

Last week in Framer performance: the first view of unoptimized pages is now much faster, especially on large sites:

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Ivan Akulov @iamakulov.com · 26/11/2025

Yeah, Redux works great because it doesn’t import anything! Here’s a case when this breaks: 1) Add a random dependency in Redux that’s used in some random function:

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Ivan Akulov @iamakulov.com · 26/11/2025

spent the day shaking the tree, shook 1.5 MB

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Ivan Akulov @iamakulov.com · 14/11/2025

Welp, turns out it’s not real. Just opening DevTools makes all timers 5-100× slower, due to the overhead of capturing stack traces. Even if you do nothing else (don’t record performance, etc)! Guess who accidentally spent a weekend optimizing this 😅 (h/t @paul.irish for explaining why)

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Ivan Akulov @iamakulov.com · 10/11/2025

Okay, so this is pretty wild: apparently, in Chromium, the deeper you are in the call stack, the slower your `setTimeout()` calls become? gist.github.com/iamakulov/85...

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Ivan Akulov @iamakulov.com · 09/11/2025

Why are native setTimeout and clearTimeout calls so expensive? Like, here it takes 1.5 ms. What’s the technical reason it’s so slow? Just 100-200 of those in a row (trivial if you’re mounting a bunch of React components that set timers) will easily block the page.

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Ivan Akulov @iamakulov.com · 31/10/2025

Belated hi from @perfnow.nl! Come talk to us (me & @kurtextrem.de) about React performance, Framer sites, LCP/INP and more :D

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Ivan Akulov @iamakulov.com · 30/10/2025

Neat lil learning from today’s @perfnow.nl (via Umar Hansa): You can now throttle individual requests in Chrome! Neat for experimenting with stuff like - lazy-loading: does the UI look okay if this chunk takes MUCH longer to arrive - resilience: what happens if this specific CDN is extremely slow

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Ivan Akulov @iamakulov.com · 24/10/2025

This lil boy (www.framer.com/updates/cms...) actually took multiple weeks of full-time work! That’s because we didn’t only fix copy-paste papercuts, we also took an opportunity to improve Framer’s text editing architecture. Story time!

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Ivan Akulov @iamakulov.com · 21/10/2025

til oxlint does some insane tricks (custom js ast interface that understands rust memory layout!) to make js plugins fast github.com/oxc-project...

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Ivan Akulov @iamakulov.com · 20/10/2025

something very cool to see: Chrome recently shipped automatic <link rel="prefetch"> for all links in viewport you could do it previously with libs like Quicklink, but it’s super cool to see this implemented natively (it’s off by default, enabled with one html tag)

Screenshot of a table titled “Proposed plan”, showing some updates to speculative rules, from the doc linked in the next post

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Ivan Akulov @iamakulov.com · 08/10/2025

feels so good to be writing something again huh

screenshot of an intro to a “Why you should ditch <Link>s and use <a>s” article. it says:

The standard advice for React/Vue/Next.js sites is to use the framework’s router to navigate between pages. A single-page router comes with a lot of goodies: prefetching, keeping state between routes, integration with framework primitives (like server components), etc. So why am I, in the year of 2025, think it’s worth switching back to `<a>`s from the 90s?

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Ivan Akulov @iamakulov.com · 01/10/2025

Got bitten by `new URL()` today. Guess why this doesn’t work?

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Ivan Akulov @iamakulov.com · 30/09/2025

soon in @Framer.com: much better ⌘C ⌘V with google docs, notion, craft, and every other editor out there (my lil non-performance side project)

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Ivan Akulov @iamakulov.com · 12/06/2025

⚡ Lighthouse (incorrectly) punishes preloading If you’re like me, you probably struggled with Lighthouse scores at least once. “I already optimized everything; why is my score still yellow?” Often, the cause is there’s more to optimize. But sometimes, it’s Lighthouse itself.

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Alex Moldovan @alexmoldovan.dev · 29/05/2025

Super cool React performance deep dive with @iamakulov.com 👏 @jsheroes.io #JSHeroes2025

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Ivan Akulov @iamakulov.com · 24/03/2025

📝 Wrote about that one time I was doing performance work and ran into an eval()-based JS minifier from 2004. (Also, it’s compatible with ES2024, guess what) 3perf.com/blog/packer/

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Ivan Akulov @iamakulov.com · 17/03/2025

Introducing @Framer.com Code Boundaries. No more optimization errors, no more blank pages, and no more searching for broken Components. (Or: how we went down the rabbit hole of React error handling for a month 🧵)

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Ivan Akulov @iamakulov.com · 20/01/2025

Stumbled upon a fun Chrome issue where you can get a high CLS score when nothing jumps on the screen – simply by using `content-visibility: auto`! Filed a bug: issues.chromium.org/issues/3911...

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jeremAIas @jeremias.codes · 16/01/2025

So excited to have @iamakulov.com this year on the conference. Stay tuned for the full lineup announcement!

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Ivan Akulov @iamakulov.com · 03/12/2024

This is the most comprehensive deep overview of React INP optimizations I’ve seen to date:

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Ivan Akulov @iamakulov.com · 03/12/2024

One of the best productivity tips I have ever learned at Framer (from @eelco.lempsink.nl) is: Whenever you want to ask a teammate for help, don’t DM them. Instead, always post your question in a channel (and cc them).

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Ivan Akulov @iamakulov.com · 02/12/2024

I found the dumbest way to preload an iframe ahead of time: <iframe src="..." sandbox="allow-same-origin"> • Downloads the iframe + its CSS/JS/etc • Puts these resources into the cache, so they’re there when you need them later • Critically, doesn’t execute any JS at all

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Ivan Akulov @iamakulov.com · 18/11/2024

Today in React wishlist: support for setting several refs on a single <div> github.com/facebook/rea...

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Ricky @ricky.fm · 14/11/2024

This fix for this is so slick: instead of reverting back to the old behavior where Suspense fallbacks have to wait for suspended siblings to render, the new feature commits fallbacks immediately, then schedules a render for the siblings after to "pre-warm" the lazy requests in the tree.

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henry ✷ @strange.website · 14/11/2024

you know what actually fuck you and in fact fuck the horse you rode in on "one of us only tells the truth and one only lies"-ass CSS property

The MDN article for the CSS property "border-end-start-radius", which is obviously completely nonsensical.

The MDN article for the CSS property "border-start-end-radius", which is ALSO completely nonsensical.

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Ivan Akulov @iamakulov.com · 13/11/2024

Hi #perfnow! Glad to be at the main conf of the year for the next three days :)

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