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Measure first: a meeting with thousands of posts, and numbers to compare #225

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opened 2026-10-21 19:04:34 +00:00 by littlefox · 1 comment

littlefox commented

2026-10-21 19:04:34 +00:00

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Groundwork for the 0.6 performance issues (D-057). Every fix there should come with a before/after number, not a feeling.

Seed: add a big meeting to devseed: a few thousand posts, with long chains, wide threads (one post with hundreds of replies), and some pictures. The real meetings on kom.lysator.liu.se that number in the thousands are the model.
Numbers, web: a Playwright spec (not part of the normal run) that reads through it and records:
- JS heap (performance.memory / CDP Runtime.getHeapUsage);
- DOM node count;
- long tasks (PerformanceObserver "longtask");
- frame times while scrolling;
- time from "Läs nästa" to the post being shown.
Numbers, desktop: RSS of the process (/proc/PID/status) over the same walk, run from the desktop smoke harness.
Output: the numbers go in a small table in the PR or the issue that changes them.

Groundwork for the 0.6 performance issues (D-057). Every fix there should come with a before/after number, not a feeling. - **Seed:** add a big meeting to `devseed`: a few thousand posts, with long chains, wide threads (one post with hundreds of replies), and some pictures. The real meetings on kom.lysator.liu.se that number in the thousands are the model. - **Numbers, web:** a Playwright spec (not part of the normal run) that reads through it and records: - JS heap (`performance.memory` / CDP `Runtime.getHeapUsage`); - DOM node count; - long tasks (`PerformanceObserver` "longtask"); - frame times while scrolling; - time from "Läs nästa" to the post being shown. - **Numbers, desktop:** RSS of the process (`/proc/PID/status`) over the same walk, run from the desktop smoke harness. - **Output:** the numbers go in a small table in the PR or the issue that changes them.

littlefox added this to the 0.6: Performance milestone

2026-10-21 19:04:34 +00:00

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2026-10-21 19:04:34 +00:00

littlefox referenced this issue

2026-10-21 19:08:08 +00:00

Local search index: up to ~80 MB in memory, and rewritten on every post once full #232

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2026-10-21 19:08:24 +00:00

Fewer server round trips when showing posts and threads #234

littlefox referenced this issue

2026-10-21 19:17:27 +00:00

Long lists like Discord: draw only what is near, cache some, refetch the rest #236

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2026-10-21 19:17:27 +00:00

Inbox reads the stat of every text in the mailbox, again on every login anywhere #237

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2026-10-21 19:22:20 +00:00

Channel list: slow at login, and redrawn in full for every post read #238

littlefox referenced this issue

2026-10-21 19:52:52 +00:00

Thread index: counts, latest, forks and dates per thread, built once and kept current #243

littlefox referenced this issue

2026-10-21 22:11:15 +00:00

Inkorg, Alla kanaler and Nytt inlägg do nothing while a channel's posts or a profile is open #250

littlefox referenced this issue

2026-10-21 22:17:08 +00:00

Inbox reads the stat of every text in the mailbox, again on every login anywhere #237

littlefox referenced this issue

2026-10-21 22:23:24 +00:00

Reading a thread at a time walks the whole thread from its root, every step #251

littlefox referenced this issue from a commit

2026-10-21 22:29:43 +00:00

Measure first: a big meeting, a perf spec and a desktop memory run

littlefox referenced this issue from a pull request that will close it,

2026-10-21 22:29:51 +00:00

Measure first: a big meeting, a perf spec and a desktop memory run #252

littlefox referenced this issue from a commit

2026-10-21 22:59:05 +00:00

Perf: a scenario for reading cards by scrolling past them

littlefox referenced this issue

2026-10-21 23:11:07 +00:00

Read by being seen without reloading the thread; redraw only what changed #254

littlefox referenced this issue

2026-10-21 23:31:36 +00:00

Read on in a thread from where reading is, not from its root #255

littlefox closed this issue

2026-10-21 23:40:03 +00:00

littlefox commented

2026-10-22 00:14:54 +00:00

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Merged in #252; main run #414 green. tools/perf.sh LABEL and tools/desktop-perf.sh LABEL give the numbers; tools/perf-table.py A B compares. Baseline table in #252. Each 0.6 PR since compares against it.

Merged in #252; main run #414 green. `tools/perf.sh LABEL` and `tools/desktop-perf.sh LABEL` give the numbers; `tools/perf-table.py A B` compares. Baseline table in #252. Each 0.6 PR since compares against it.