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Syntax highlighting for very large files incredibly slow

Created by: limitedmage

  • Sourcegraph version: 3.41
  • Platform information: N/A

Issue reported by https://github.com/sourcegraph/accounts/issues/8205 Network trace available at https://drive.google.com/file/d/1Mc899L8ckNAIQVac791xYKgD9LJAra_T/view?usp=sharing

Steps to reproduce:

  1. In site config, set "search.largeFiles": ["**/**"] so very large files are all indexed
  2. Run a search that returns many very large files, but only one chunk per result.
  3. Wait for results to load

Expected behavior:

Results load

Actual behavior:

Results load with blank boxes and take forever to populate, if ever. The network tab shows that syntax highlighting is pending for a very long time; it may eventually complete or time out.