A flick through the feed no longer drags background work through the middle of it. "When I flick to scroll, it's not getting up to speed very quickly, and clicking around in the app feels a bit sluggish at times" (Adam, 2026-11-07). Measured on his Pixel 9 in the installed PWA: idle is quiet (0.16 s of script in 10 s), but three real flicks through Following spent 1.7 s of 9 on the main thread, frames up to 200 ms, and the work was the avatar thumbnailer finishing faces as they scrolled in: a synchronous canvas.toDataURL WebP encode per face (229 ms), the profile cache JSON.stringified twice per half-second flush (once just to measure it, up to ~2 MB with thumbnails), and a whole-page repaint per finished face that changes nothing on screen (feed rows keep the face they were admitted with). Now: the crop, resize and encode happen off the main thread (createImageBitmap with resizeWidth/Height, OffscreenCanvas.convertToBlob, FileReader), with the old canvas path as the fallback; a finished face is recorded once the page settles; scheduleRepaint holds while a finger is down or the page scrolled in the last 200 ms (at most 1.5 s), and the profile flush likewise (at most 5 s, forced on an account switch) and sizes the blob by summing rows instead of stringifying it. Tests: the create flow's heads-up / passphrase / check steps from earlier today broke every test that made a wallet by waiting for the words and clicking "Skip verification"; tools/puppeteer.js exports seedWords() and skipSeedCheck() and the 96 tests use them. room-faces and avatar-profile fail the same way on 8858591 (row.hover, scrollIntoView), before today's changes

Co-Authored-By: Claude Opus 5.5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01VMan6Ts5Tktega8VbLg31q

1 files changed, 3 insertions, 3 deletions

diff --git a/tools/video-compress-test.js b/tools/video-compress-test.js
index 19735c8..2b83edc 100644
--- a/tools/video-compress-test.js
+++ b/tools/video-compress-test.js
@@ -4,7 +4,7 @@
 // upload is caught and its bytes checked with ffprobe.
 //
 // Run: bun tools/video-compress-test.js
-import puppeteer from './puppeteer.js';
+import puppeteer, { seedWords, skipSeedCheck } from './puppeteer.js';
 const sleep = (ms) => new Promise((r) => setTimeout(r, ms));
 let ok = true;
 const check = (n, c, d = '') => { console.log(` ${c ? '✓' : '✗'} ${n}${d ? ' — ' + d : ''}`); if (!c) ok = false; };
@@ -73,8 +73,8 @@ try {
   await page.reload({ waitUntil: 'domcontentloaded' });
   await sleep(600);
   await click('create a new wallet'); await sleep(600);
-  await page.waitForSelector('.words .w .t');
-  await click('skip verification');
+  await seedWords(page);
+  await skipSeedCheck(page);
   await waitText('receive', 20000);
   check('the browser can encode H.264 (WebCodecs)', await page.evaluate(async () => (await VideoEncoder.isConfigSupported({ codec: 'avc1.42001f', width: 1280, height: 720, bitrate: 2.5e6 })).supported));
   // the post composer: the pencil on the feed