Old staggered drain (50ms per post) was added for visual polish but
made infinite scroll painfully slow — a 40-post page took 2 seconds
just to add to the grid. Thumbnails already load async via _fetch_thumbnail,
so the stagger was just delaying grid population for no real benefit.
Now all posts are added instantly in one pass with thumbnails filling in
as they arrive. Scroll trigger widened from 1 row to 3 rows from bottom
so the next page starts loading before you reach the end.
pax
bda92a0a87