Threads open at once from the replies already in hand, and fill in as the relays answer.

Adam, 2026-10-16: "Still seeing a spinner sometimes when I click into a
thread." Three things stood between a tap and the conversation. (1) The feed
already fetches every reply to each post on screen — the count on the reply
button comes from them (watchZaps, kinds 1 and 1111 by #e) — and then kept
only their ids. Now the replies themselves are kept (replyEvents: the 400
targets most recently heard from, 60 each) and a thread is seeded from them
when it is opened (repliesInHand: those naming the root, and those naming
only the reply they answer), so a post that has been on screen opens as the
whole conversation, no relay asked; a thread fetched ahead before the count
answered takes them when opened, and the open thread takes them when the
count fetch lands (adoptRepliesInHand). (2) The loader waited for every
relay's EOSE — the slowest relay, 4.5 s at worst — before the thread
replaced its spinner; now replies go in as they arrive (queryStreamOn), the
page repainted in place, and the root the moment it is found. (3) The
spinner stood under whatever was already there while the load ran; now it
shows only while there is nothing to read, and "no replies" only once the
relays have spoken. And the fetch-ahead fires after 600 ms of reading
instead of 1.2 s (a quick reader beat it to the tap), a dozen a minute.

tools/thread-instant-test.js (the relays answered in the page): a post read
for a moment is fetched ahead, the count answer released only after that
entry exists, and the thread opens with its reply 12 ms after the tap, not
after its own 6 s ask; a post on screen opens whole in 16 ms with the three
replies the count brought, before the relays answer the thread's ask, and
their answer adds nothing twice; a post with nothing in hand shows a spinner,
then its first reply at ~470 ms with the slow one still on its way, the
spinner gone, the slow one landing in place. thread-prefetch-test follows
the new dwell and rate; thread-cache, thread-pager, thread-back-scroll,
feed-conversations, moderation, feed-live, feed-switch-seed, profile-pager,
notif-report-fold and reply-count pass (thread-reply-test's 30 s wait fails
on clean HEAD the same way).

Co-Authored-By: Claude Fable 5.1 <[email protected]>
Claude-Session: https://claude.ai/code/session_01J1Kon8bxJoHRpJdSzshCkp

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