# NousResearch/hermes-agent · Fix quadratic cost when accumulating streamed reply text

## Open now

- Nothing open on GitHub.

These items address a performance problem where streamed assistant reply text was being rebuilt from scratch on every incoming delta, causing the total work per turn to scale with the square of the reply length. The changes propose accumulating text as parts instead of concatenating repeatedly.

## TL;DR

- 3 member(s): 0 open issue(s), 1 closed issue(s), 0 open PR(s), 1 merged PR(s), 1 PR(s) closed without merging.
- A fix was merged to main in PR #101707. Verify it addresses your case.
- **Recommended:** read PR #101707 (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: `unresolved`. 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evidence (`STRUCTURAL_SPANNING`): every member is connected by structural evidence: shared changed files, or a closing/superseded reference.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 `0.67`: 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

- #92163: \[Bug\]: streamed assistant text is rebuilt on every delta, making a turn cost the square of the reply length

## Prior & competing PRs

- **#101707: perf(agent): accumulate streamed reply text as parts instead of rebuilding per delta (salvage #92166)**. merged to main · fix tier `verified`
  - maintainer direction: category `merged`
  - files: `run_agent.py`, `tests/run_agent/test_streamed_text_accumulation.py`
- **#92166: perf(agent): stop rebuilding the streamed reply text on every delta**. closed without merge
  - maintainer direction: category `merged_via`; implication `superseded`; refs `7caee2898b`, `#101707`

## Fix status

- Merged to main in PR #101707 (cited above). No release data is tracked. Verify downstream.
- Fix last verified (merged) `2026-09-02`.
- Subsystem: `agent`