The sourceIds array was computed inline in the template via a complex reduce/forEach/filter chain. This meant it re-ran on every component re-render, including every streaming content update, even though it only depends on sources and model which rarely change during streaming. Move the computation to a reactive variable so Svelte only recalculates it when its actual dependencies change.
this is a completely invisible change - free lunch
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## 📋 Pull Request Information
**Original PR:** https://github.com/open-webui/open-webui/pull/21883
**Author:** [@Classic298](https://github.com/Classic298)
**Created:** 2/25/2026
**Status:** ❌ Closed
**Base:** `dev` ← **Head:** `perf/memoize-sourceids`
---
### 📝 Commits (1)
- [`63c512b`](https://github.com/open-webui/open-webui/commit/63c512bb98529fec85fa68f4bd729f7a1800d4c4) perf: memoize sourceIds computation in ContentRenderer
### 📊 Changes
**1 file changed** (+35 additions, -30 deletions)
<details>
<summary>View changed files</summary>
📝 `src/lib/components/chat/Messages/ContentRenderer.svelte` (+35 -30)
</details>
### 📄 Description
The sourceIds array was computed inline in the template via a complex reduce/forEach/filter chain. This meant it re-ran on every component re-render, including every streaming content update, even though it only depends on sources and model which rarely change during streaming. Move the computation to a reactive variable so Svelte only recalculates it when its actual dependencies change.
<ins>**this is a completely invisible change - free lunch**</ins>
### Contributor License Agreement
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By submitting this pull request, I confirm that I have read and fully agree to the [Contributor License Agreement (CLA)](https://github.com/open-webui/open-webui/blob/main/CONTRIBUTOR_LICENSE_AGREEMENT), and I am providing my contributions under its terms.
> [!NOTE]
> Deleting the CLA section will lead to immediate closure of your PR and it will not be merged in.
---
<sub>🔄 This issue represents a GitHub Pull Request. It cannot be merged through Gitea due to API limitations.</sub>
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📋 Pull Request Information
Original PR: https://github.com/open-webui/open-webui/pull/21883
Author: @Classic298
Created: 2/25/2026
Status: ❌ Closed
Base:
dev← Head:perf/memoize-sourceids📝 Commits (1)
63c512bperf: memoize sourceIds computation in ContentRenderer📊 Changes
1 file changed (+35 additions, -30 deletions)
View changed files
📝
src/lib/components/chat/Messages/ContentRenderer.svelte(+35 -30)📄 Description
The sourceIds array was computed inline in the template via a complex reduce/forEach/filter chain. This meant it re-ran on every component re-render, including every streaming content update, even though it only depends on sources and model which rarely change during streaming. Move the computation to a reactive variable so Svelte only recalculates it when its actual dependencies change.
this is a completely invisible change - free lunch
Contributor License Agreement
By submitting this pull request, I confirm that I have read and fully agree to the Contributor License Agreement (CLA), and I am providing my contributions under its terms.
🔄 This issue represents a GitHub Pull Request. It cannot be merged through Gitea due to API limitations.