Opening the chat froze the machine: the log rendered all ~800 loaded messages (1.1 M characters, ~10,000 nodes,
a 440,000 px column) and rebuilt the whole log on every new message, receipt change and mark refresh - about
1.8 s of blocked main thread each time. Now:
- the log keeps the newest 150 rows; "Load earlier" adds 150 more (from memory, then the server) and keeps the
reader's place; switching person or thread starts again at 150
- new messages are appended; a changed receipt, pin, correction or answer repaints only its row
- off-screen rows skip layout and paint (content-visibility); the Intl date formatters are made once
- polls go through every(): no overlapping requests; while the tab is hidden messages poll every 10 s (sound and
notifications still work), people every 60 s, the overview every 30 s, and the marks refresh and board panels pause
- removed the backdrop-filter blurs on the sidebar, top bar and composer, and the live dot's endless box-shadow
animation (now opacity)
Measured: forced full render 1,600-1,850 ms -> 16-21 ms (hidden pane, render + layout); load long task 1,806 ms -> 56 ms;
DOM 13,318 -> 5,282 nodes (log 9,870 -> 1,806); a new message appends 2 nodes with no long task; hidden-tab traffic
~37 requests / ~2 MB per 30 s -> 4 requests / 156 KB.
KeelrLeek
580fcfacb4
