alertComponent() and the details block renderer both call marked.lexer() inline during rendering. Since these run inside {#each tokens} loops, they re-lex on every render cycle even when the text content hasn't changed. Add a simple text-keyed cache (capped at 100 entries) that returns cached tokens for unchanged text, avoiding redundant parsing during streaming.
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🔄 This issue represents a GitHub Pull Request. It cannot be merged through Gitea due to API limitations.
## 📋 Pull Request Information
**Original PR:** https://github.com/open-webui/open-webui/pull/22105
**Author:** [@Classic298](https://github.com/Classic298)
**Created:** 3/1/2026
**Status:** ❌ Closed
**Base:** `dev` ← **Head:** `perf/cache-sublexer-calls`
---
### 📝 Commits (1)
- [`c00d3a4`](https://github.com/open-webui/open-webui/commit/c00d3a4d94a20a62ea3409aaef71f9ecb86d508d) perf: cache marked.lexer() calls for alert and details block content
### 📊 Changes
**2 files changed** (+17 additions, -3 deletions)
<details>
<summary>View changed files</summary>
📝 `src/lib/components/chat/Messages/Markdown/AlertRenderer.svelte` (+15 -1)
📝 `src/lib/components/chat/Messages/Markdown/MarkdownTokens.svelte` (+2 -2)
</details>
### 📄 Description
alertComponent() and the details block renderer both call marked.lexer() inline during rendering. Since these run inside {#each tokens} loops, they re-lex on every render cycle even when the text content hasn't changed. Add a simple text-keyed cache (capped at 100 entries) that returns cached tokens for unchanged text, avoiding redundant parsing during streaming.
### 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/22105
Author: @Classic298
Created: 3/1/2026
Status: ❌ Closed
Base:
dev← Head:perf/cache-sublexer-calls📝 Commits (1)
c00d3a4perf: cache marked.lexer() calls for alert and details block content📊 Changes
2 files changed (+17 additions, -3 deletions)
View changed files
📝
src/lib/components/chat/Messages/Markdown/AlertRenderer.svelte(+15 -1)📝
src/lib/components/chat/Messages/Markdown/MarkdownTokens.svelte(+2 -2)📄 Description
alertComponent() and the details block renderer both call marked.lexer() inline during rendering. Since these run inside {#each tokens} loops, they re-lex on every render cycle even when the text content hasn't changed. Add a simple text-keyed cache (capped at 100 entries) that returns cached tokens for unchanged text, avoiding redundant parsing during streaming.
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.