oficina / docs Public

An edit reaches your other tabs in 250ms, not two seconds

DEBOUNCE_MS was never a decision about feel. Every accepted POST is one
doc_updates row, and maxRetainedUpdates capped a document at 4096 of
them before it refused edits permanently, so the constant was headroom
against a cliff: 400ms bought about 27 minutes of continuous typing,
2000ms about 2h16m. Snapshots removed the cliff, so it is free to be a
number about perception — 250ms, under the roughly 300ms at which a
delay stops reading as a response and starts reading as a wait.

The comment it carried has been rewritten rather than trimmed. Its
whole justification was that arithmetic, which is now false, and this
is the exact shape of stale-derived-number the snapshots branch tripped
over five times. It now says why 250ms, what the old value was for, and
what the change costs.

That cost, stated in the code and in the spec rather than discovered
later: eight times the row rate, roughly 14,400 doc_updates rows an
hour of continuous typing against the old 1,800. Snapshots bound what
that costs to replay; nothing yet bounds what it costs to store,
because section 4.1's compaction horizon is still deferred, so the log
and the WAL Litestream replicates grow eight times faster. Coalescing
same-actor updates at the storage boundary is what would give the rows
back without giving back the latency, and it belongs with the WebSocket
transport that needs it anyway.

The live-sync spec's 7.5 said in as many words that live meant within
about two seconds of the typist pausing. It now records that as what
shipped, and why it is superseded, rather than being quietly edited to
match the new number.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

Paul Campbell pushed by paul@keymail.dev 1 month ago 2392ea38a2d594fdfe6d8c4fdb6c7147926af274 parent 6bb0a03

3 files changed, +63 −28

docs/superpowers/specs/2026-09-01-live-sync-design.md +25 −11
fixtures/editor-entry.js +37 −16
internal/docs/static/{editor.6029d6f8d990c8a4.js => editor.0c0322ca56426314.js} +1 −1

landed from worktree-debounce

diff --git a/docs/superpowers/specs/2026-09-01-live-sync-design.md b/docs/superpowers/specs/2026-09-01-live-sync-design.md

index 42c5e4c..c167081 100644

--- a/docs/superpowers/specs/2026-09-01-live-sync-design.md

+++ b/docs/superpowers/specs/2026-09-01-live-sync-design.md

@@ -24,7 +24,8 @@ left out.

Editing is plain HTTP. The browser fetches `GET /d/{sqid}/updates`

(`internal/docs/handlers.go:311`), which returns every row of the document's update

log concatenated in seq order, and replays it into a `Y.Doc`. Edits produce Yjs

-updates which are debounced 2000ms, merged, and POSTed back

+updates which are debounced (2000ms as this design shipped; 250ms since — §7.5),

+merged, and POSTed back

(`internal/docs/handlers.go:359`), validated through the Rust core and appended to

`doc_updates`. Both routes are owner-scoped through one helper

(`getDocumentForUpdates`, `handlers.go:277`) and sit inside the `RequireSession` group

@@ -320,18 +321,31 @@ it: POST is unaffected and edits are still saving. Repeated `EventSource` failur

the stream and leave the tab to heal on the next activity-triggered reopen. Logged to

the console; nothing user-visible in this slice, and therefore no new catalog keys.

-### 7.5 The debounce stays at 2000ms

+### 7.5 The debounce — 2000ms at the time of writing, 250ms since

`DEBOUNCE_MS` sets the floor on how live this can feel: the other tab cannot see an

-edit before the originating tab sends it. Shortening it spends headroom against

-`internal/core/core.go`'s `maxRetainedUpdates` (4096, no compaction yet) — 4096 × 2s is

-about 2h16m of continuous typing, 4096 × 0.8s about 55 minutes — and a sibling

-session's formatting toolbar makes the same arithmetic worse, since one toolbar command

-is one transaction is one retained update.

-So **"live" here means "within about two seconds of the typist pausing"**, stated

-plainly rather than papered over. Snapshot cadence and compaction (§4.1) are the real

-prerequisite for making it snappier, and they are their own plan.

+edit before the originating tab sends it.

+**As this design shipped, it was 2000ms, and that was not a decision about feel.**

+Every accepted POST is one `doc_updates` row, and `internal/core/core.go`'s

+`maxRetainedUpdates` (4096, no compaction at the time) capped a document at that many

+before it refused edits permanently. So the constant was headroom against a cliff —

+4096 × 2s is about 2h16m of continuous typing, 4096 × 0.8s about 55 minutes — and

+**"live" therefore meant "within about two seconds of the typist pausing"**, stated

+plainly rather than papered over.

+**Superseded 2026-09-01 by the snapshots work** (`2026-09-01-snapshots-design.md`,

+landed as `6bb0a03`). Replay now starts from a snapshot plus a bounded tail, the cliff

+is gone, and the constant became free to be about perception. It is **250ms** — under

+the roughly 300ms at which a delay stops reading as a response and starts reading as a

+wait. "Live" now means within about a quarter-second of the typist pausing, plus a

+round trip.

+What that costs is stated where it belongs, in `DEBOUNCE_MS`'s own comment: eight times

+the row rate, bounded for replay by snapshots and **not** bounded for storage, because

+§4.1's compaction horizon is still deferred. The mechanism that would return the rows

+without returning the latency is §4.1's coalescing at the storage boundary, which

+belongs with the WebSocket transport.

## 8. Why presence is separable

diff --git a/fixtures/editor-entry.js b/fixtures/editor-entry.js

index b5539b0..aafa1f8 100644

--- a/fixtures/editor-entry.js

+++ b/fixtures/editor-entry.js

@@ -66,23 +66,44 @@ const schema = new Schema({

marks,

})

-// Coalesce a burst of typing into one request. Widened from Task 6's

-// original 400ms (fix round 1, F3): at one accepted row per flush,

-// core.Handle's maxRetainedUpdates cap (internal/core/core.go, 4096)

-// was reachable after only ~27 minutes of continuous typing

-// (4096 * 400ms ≈ 27min). 2000ms stretches the same arithmetic to

-// 4096 * 2s ≈ 8192s ≈ 136 minutes — about 2h16m of typing with no

-// pause longer than 2 seconds anywhere in it, which real writing

-// does not do; ordinary pauses (thinking, punctuation, rereading)

-// push the practical number well past that worst case. Nothing here

-// shows a "saving" indicator during an ordinary 2s wait — only a

+// Coalesce a burst of typing into one request.

+//

+// This constant is the floor on how fast an edit can reach anyone

+// else: nothing leaves the tab that made it until the window closes,

+// so the stream, the fetch and the render all happen after it. 250ms

+// is chosen for that — under the ~300ms at which a delay stops

+// reading as "the app responded" and starts reading as "the app is

+// thinking" — rather than for any property of the server.

+//

+// It could not be chosen that way until recently, and the history is

+// worth keeping because the old value looked like a feel decision and

+// was not. Every accepted POST is one doc_updates row, and

+// core.Handle's maxRetainedUpdates (internal/core/core.go, 4096)

+// capped a document at that many, after which it refused edits

+// permanently. The value was therefore headroom against a cliff:

+// 400ms bought ~27 minutes of continuous typing, 2000ms bought about

+// 2h16m. Snapshots removed the cliff — replay now starts from a

+// snapshot plus a bounded tail — so this is free to be a number about

+// perception again.

+//

+// What it still costs, because this is not free and the next reader

+// should not have to rediscover it: eight times the row rate, roughly

+// 14,400 doc_updates rows an hour of continuous typing against the

+// old 1,800, each holding a character or two rather than a sentence.

+// Snapshots bound what that costs to REPLAY; nothing yet bounds what

+// it costs to STORE, because §4.1's compaction horizon is still

+// deferred, so the log and the WAL Litestream replicates grow eight

+// times faster than they did. The fix that would give back the rows

+// without giving back the latency is §4.1's other mechanism —

+// coalescing same-actor updates at the storage boundary — and it

+// belongs with the WebSocket transport, which needs it anyway.

+//

+// Nothing shows a "saving" indicator during an ordinary wait; only a

// failure does, via the save queue's own status (see save-queue.mjs

-// and views/show.html's [docs-save-status]) — so this delay is

-// invisible exactly when saving is going fine, which is the case

-// that matters for feel. This only buys headroom against the cap;

-// the real fix is snapshot/compaction (core.go's own comment on

-// maxRetainedUpdates).

-const DEBOUNCE_MS = 2000

+// and views/show.html's [docs-save-status]). So this delay stays

+// invisible exactly when saving is going fine, which is the case that

+// matters for feel.

+const DEBOUNCE_MS = 250

// applyServerLog replays handlers.go's updatesGet response into ydoc.

// That response is a raw concatenation of one encoded Yjs update per

diff --git a/internal/docs/static/editor.6029d6f8d990c8a4.js b/internal/docs/static/editor.0c0322ca56426314.js

similarity index 99%

rename from internal/docs/static/editor.6029d6f8d990c8a4.js

rename to internal/docs/static/editor.0c0322ca56426314.js

index 6817228..9f16e28 100644

--- a/internal/docs/static/editor.6029d6f8d990c8a4.js

+++ b/internal/docs/static/editor.0c0322ca56426314.js

@@ -11,4 +11,4 @@ ${t.toString()}`)},so=class{constructor(e){this.patterns=[],this.$state=e}if(e,t

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t=this.pos;this.view.state.doc!=this.startDoc&&(t=this.view.posAtCoords(zr(e))),this.updateAllowDefault(e),this.allowDefault||!t?Ze(this.view,"pointer"):ry(this.view,t.pos,t.inside,e,this.selectNode)?e.preventDefault():e.button==0&&(this.flushed||re&&this.mightDrag&&!this.mightDrag.node.isAtom||Q&&!this.view.state.selection.visible&&Math.min(Math.abs(t.pos-this.view.state.selection.from),Math.abs(t.pos-this.view.state.selection.to))<=2)?($r(this.view,E.near(this.view.state.doc.resolve(t.pos)),"pointer"),e.preventDefault()):Ze(this.view,"pointer")}move(e){this.updateAllowDefault(e),Ze(this.view,"pointer"),super.move(e)}updateAllowDefault(e){!this.allowDefault&&(Math.abs(this.event.x-e.clientX)>4||Math.abs(this.event.y-e.clientY)>4)&&(this.allowDefault=!0)}delaySelUpdate(){return this.allowDefault?(this.delayedSelectionSync=!0,!0):!1}},Rl=class extends 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o=s.nextSibling;for(;o&&o.nodeName!="TD"&&o.nodeName!="TH";)o=o.nextSibling;if(o){let l=o;for(;;){let c=l.firstChild;if(!c||c.nodeType!=1||c.contentEditable=="false"||/^(BR|IMG)$/.test(c.nodeName))break;l=c}l.insertBefore(s,l.firstChild),r==s&&n.domSelection().collapse(s,i)}else s.parentNode.removeChild(s)}}function Cy(n,e,t,r){let{node:i,fromOffset:s,toOffset:o,from:l,to:c}=n.docView.parseRange(e,t),a=n.domSelectionRange(),h,f=a.anchorNode;if(f&&n.dom.contains(f.nodeType==1?f:f.parentNode)&&(h=[{node:f,offset:a.anchorOffset}],Cs(a)||h.push({node:a.focusNode,offset:a.focusOffset})),Q&&n.input.lastKeyCode===8)for(let y=o;y>s;y--){let k=i.childNodes[y-1],w=k.pmViewDesc;if(k.nodeName=="BR"&&!w){o=y;break}if(!w||w.size)break}let 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t=this._props;this._props=e,e.plugins&&(e.plugins.forEach(Mf),this.directPlugins=e.plugins),this.updateStateInner(e.state,t)}setProps(e){let t={};for(let r in this._props)t[r]=this._props[r];t.state=this.state;for(let r in e)t[r]=e[r];this.update(t)}updateState(e){this.updateStateInner(e,this._props)}updateStateInner(e,t){var r;let i=this.state,s=!1,o=!1;e.storedMarks&&this.composing&&(tu(this),o=!0),this.state=e;let l=i.plugins!=e.plugins||this._props.plugins!=t.plugins;if(l||this._props.plugins!=t.plugins||this._props.nodeViews!=t.nodeViews){let d=Ef(this);Iy(d,this.nodeViews)&&(this.nodeViews=d,s=!0)}(l||t.handleDOMEvents!=this._props.handleDOMEvents)&&Il(this),this.editable=Of(this),Df(this);let c=ml(this),a=Tf(this),h=i.plugins!=e.plugins&&!i.doc.eq(e.doc)?"reset":e.scrollToSelection>i.scrollToSelection?"to selection":"preserve",f=s||!this.docView.matchesNode(e.doc,a,c);(f||!e.selection.eq(i.selection))&&(o=!0);let 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