Allow configuration of syntax highlighting limits for large files (e.g., XML)

[vpoguru]

Feature Request: Enable or configure syntax highlighting for large files

Summary

Currently, Zed completely disables syntax highlighting for large files — such as long XML documents — likely for performance reasons. This is understandable, but for some workflows, it's important to have syntax highlighting even on large files.

It would be great to have a user-configurable option to allow syntax highlighting for large files, giving users the choice to trade performance for functionality when needed.

Use Case

When working with large XML files (e.g., 2,000+ lines), Zed does not apply any syntax highlighting — the entire file renders as plain text. This makes it difficult to read or navigate structured files that rely heavily on tags or nesting for context.

For users working with verbose formats like XML, JSON, or large HTML documents, syntax highlighting is crucial for editing accuracy and efficiency.

Proposed Solution

Introduce a setting such as:

"syntax.enableHighlightingForLargeFiles": true

[harmohitsandhu]

+1
I was just working on a large XML file and Zed stopped highlighting syntax. XML syntax highlighting for large XML files works completely fine on VSCodium though.