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/pager-prime-test.js b/tools/pager-prime-test.js
index 4989790..df20cc7 100644
--- a/tools/pager-prime-test.js
+++ b/tools/pager-prime-test.js
@@ -15,7 +15,7 @@
 // that); on a link slower than the clip, more — to the 4 MB cap. With Data
 // Saver on, the pager is careful again: such a clip waits for a tap and
 // nothing loads ahead.
-import puppeteer from './puppeteer.js';
+import puppeteer, { seedWords, skipSeedCheck } from './puppeteer.js';
 import { cacheKeyFor } from '../src/wallet.js';
 import { generateSecretKey, getPublicKey, finalizeEvent } from 'nostr-tools/pure';
 import { buildHtml } from '../build.js';
@@ -97,9 +97,9 @@ async function run() {
     await page.evaluate(() => localStorage.setItem('btc-wallet-network', 'regtest'));
     await page.reload({ waitUntil: 'domcontentloaded' }); await sleep(400);
     await click('create a new wallet'); await sleep(600);
-    await page.waitForSelector('.words .w .t');
+    await seedWords(page);
     const mn = (await page.$$eval('.words .w .t', (l) => l.map((e) => e.textContent.trim()))).join(' ');
-    await click('skip verification');
+    await skipSeedCheck(page);
     await waitText('receive', 20000);
     const base = cacheKeyFor(mn + '\n');
     await page.evaluate(([k, pk, ns]) => {