# NousResearch/hermes-agent · Desktop streaming performance and transcript length costs

## Open now

- Nothing open on GitHub.

These issues and pull requests address performance problems in desktop streaming sessions, specifically that processing costs grew with transcript/history length. Work focuses on reducing redundant computation during streaming, such as re-extracting settled prompts and running timeline work unnecessarily.

## TL;DR

- 6 member(s): 0 open issue(s), 1 closed issue(s), 0 open PR(s), 3 merged PR(s), 2 PR(s) closed without merging.
- A fix was merged to main in PR #71780. Verify it addresses your case.
- **Recommended:** read PR #71780 (and any competing PRs below) before filing. Confirm the merged change covers your symptom.

## Maintainer resolution verdict

- Internal-tracker verdict over this cluster's issue members: `resolved` · deciding PR(s): `pr-71835`. This is distinct from the fix status above. Weigh it yourself.

## How this cluster was grouped

- Link evidence (`STRUCTURAL_SPANNING`): every member is connected by structural evidence: shared changed files, or a closing/superseded reference.
- Pairwise link density `0.40`: the share of member pairs that carry a link, counting a structural link in full and a relevance-only link at 0.36. `1.00` means every pair is linked.

## Closed / duplicate issues

- #69120: Desktop streaming cost grows with transcript length

## Prior & competing PRs

- **#71780: perf(desktop): make multitab streaming sessions fast**. merged to main · fix tier `verified`
  - maintainer direction: category `merged`; implication `superseded`
  - files: `apps/desktop/scripts/perf/scenarios/index.mjs`, `apps/desktop/scripts/perf/scenarios/multitab.mjs`, `apps/desktop/src/app/chat/index.tsx`, `apps/desktop/src/components/assistant-ui/thread/timeline.tsx`, `apps/desktop/src/components/pane-shell/pane-visibility.ts`, `apps/desktop/src/components/pane-shell/tree/renderer/tree-group.tsx`
- **#71789: perf(desktop): stop the thread timeline working when nothing can see it**. merged to main · fix tier `verified`
  - maintainer direction: category `merged`; implication `superseded`
  - files: `apps/desktop/src/components/assistant-ui/thread/timeline-data.test.ts`, `apps/desktop/src/components/assistant-ui/thread/timeline-data.ts`, `apps/desktop/src/components/assistant-ui/thread/timeline-idle.test.tsx`, `apps/desktop/src/components/assistant-ui/thread/timeline.tsx`
- **#71835: perf(desktop): make streaming cost independent of transcript length**. merged to main · fix tier `verified`
  - maintainer direction: category `merged`; implication `superseded`
  - files: `apps/desktop/scripts/perf/scenarios/index.mjs`, `apps/desktop/scripts/perf/scenarios/stream-history.mjs`, `apps/desktop/scripts/perf/scenarios/stream.mjs`, `apps/desktop/src/app/chat/runtime-repository.ts`, `apps/desktop/src/app/session/hooks/use-message-stream/index.ts`, `apps/desktop/src/app/session/hooks/use-message-stream/stream-flush.test.tsx`, `apps/desktop/src/lib/incremental-external-store-runtime.test.ts`, `apps/desktop/src/lib/incremental-external-store-runtime.ts`
- **#69151: fix(desktop): reduce long-history streaming work**. closed without merge
  - maintainer direction: category `superseded_by_pr`; implication `superseded`; refs `#71835`, `#71789`, `#71780`
- **#128818: perf(desktop): stop re-extracting every settled prompt per streamed delta**. closed without merge
  - maintainer direction: category `uncategorized`; implication `needs_llm`

## Fix status

- Merged to main in PR #71780 (cited above). No release data is tracked. Verify downstream.
- Fix last verified (merged) `2026-07-26`.
- Subsystem: `apps/desktop`