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8a0db228a6 perf(ui): improve Decisions scrolling performance (#9468)
## Thinking Path

> - Paperclip is the open source app people use to manage AI agents for
work
> - Operators use the Decisions page to review an uncapped attention
feed across active, snoozed, and dismissed items
> - Large feeds mounted every row eagerly, and routine interactions
re-rendered the full queue
> - That made initial paint and scrolling progressively slower as
decision history accumulated
> - This pull request bounds rendering, stabilizes row props, and lets
off-screen rows skip layout and paint work
> - The benefit is a responsive Decisions page even for companies with
large attention histories

## Linked Issues or Issue Description

### What happened?

Opening `/decisions` for a company with a large attention history
eagerly mounted every visible-feed row. Expanding, selecting,
dismissing, snoozing, or restoring an item could also re-render the
entire queue.

### Expected behavior

The page should render a bounded initial window, progressively reveal
more rows near the scroll boundary, and avoid re-rendering unaffected
rows during interactions.

### Steps to reproduce

1. Populate a company with hundreds of attention items.
2. Open `/decisions`.
3. Scroll and interact with individual rows.
4. Observe increasing initial render, layout, paint, and interaction
cost on the previous implementation.

### Paperclip version or commit

Reproduced on `master` before this PR.

### Deployment and installation

Local development, built from source. This is a core UI issue, not
adapter- or database-specific.

### Additional context

Searched open public issues and PRs; no duplicate was found.

## What Changed

- Added a pure `planAttentionRenderRows` helper that allocates one
render budget across active groups and open snoozed/dismissed curtains
in document order.
- Render 50 rows initially and add 100 more when the Decisions page
approaches the scroll boundary.
- Memoized `AttentionQueueRow`, stabilized parent callbacks and inbox
dismissal actions, and passed row items through a shared expand
callback.
- Added `content-visibility: auto` and intrinsic containment so
accumulated off-screen rows avoid unnecessary layout and paint work.
- Added render-plan coverage and a regression test proving identical row
props do not re-render after a parent update.

## Verification

- `pnpm -C ui typecheck`
- `pnpm -C ui exec vitest run src/lib/attention.test.ts
src/components/AttentionQueueRow.test.tsx
src/components/Sidebar.test.tsx src/pages/Inbox.test.tsx` — 96 tests
passed
- `pnpm check:token-gates` — all gates clean

## Risks

- Low risk: the change is UI-only and does not alter API or database
contracts.
- The main behavioral risk is incorrect row-budget accounting across
collapsed groups or open curtains; the pure planner has focused tests
for ordering, truncation, and collapsed/closed sections.
- Progressive rendering means rows beyond the current budget are
intentionally absent until scrolling nears the boundary, matching the
existing Issues list pattern.

> This is a targeted performance fix and does not overlap planned core
feature work in `ROADMAP.md`.

## Model Used

- Anthropic Claude Fable 5 assisted with the implementation using
repository tools and code execution.
- OpenAI Codex `gpt-5.6-sol` prepared and verified the PR with high
reasoning effort, repository tools, shell execution, and
GitHub/Paperclip API access. The runtime did not expose a context-window
size.

## Checklist

- [x] I have included a thinking path that traces from project context
to this change
- [x] I have specified the model used (with version and capability
details)
- [x] I have checked ROADMAP.md and confirmed this PR does not duplicate
planned core work
- [x] I have searched GitHub for duplicate or related PRs and linked
them above
- [x] I have either (a) linked existing issues with `Fixes: #` / `Closes
#` / `Refs #` OR (b) described the issue in-PR following the relevant
issue template
- [x] I have not referenced internal/instance-local Paperclip issues or
links (only public GitHub `#NNN` / `github.com/paperclipai/paperclip`
URLs)
- [x] My branch name describes the change (e.g. `docs/...`, `fix/...`)
and contains no internal Paperclip ticket id or instance-derived details
- [x] I have run tests locally and they pass
- [x] I have added or updated tests where applicable
- [x] I have updated relevant documentation to reflect my changes (no
documentation changes were required for this UI-only behavior)
- [x] I have considered and documented any risks above
- [x] All Paperclip CI gates are green
- [x] Greptile is 5/5 with no open P2s, recommendations, or follow-ups
- [x] I will address all Greptile and reviewer comments before
requesting merge

---------

Co-authored-by: Claude Fable 5 <noreply@anthropic.com>
Co-authored-by: Paperclip <noreply@paperclip.ing>
2026-07-12 20:44:52 -05:00
..

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