A Perf test (tests/e2e/Perf/FeedPerfTests, Category=Perf) scrolls load0's
home, thousands of posts from SocialPub's load runs, to 2000 posts. Before:
100 cards took 12 s to reach, 1000 took 437 s, 2000 took 29 minutes; the
main thread was busy almost all of that time, and the page held 224 000 DOM
nodes and 920 MB of .NET heap. Every card re-rendered whenever the list did.
- A card re-renders only when its own events run or its render key changes
(Content.RenderKey: the post, its status, notification, conversation,
place and grouping, where it is shown, the persona and the connection).
2000 cards then took 122 s.
- The list is a <Virtualize>: only the cards near the view are rendered.
The page now holds about 3 000 DOM nodes and 145 MB however long the feed
is, and each page of older posts costs the same (about 1.9 s in the test's
scroll loop) at the 100th post as at the 1700th. The feed tells how many
posts it holds in data-feed-count.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01LsXgEaXee4GCU1hwYgPJXw
thepraandClaude Opus 5.5
a5178a67b1