Custom highlighting patterns doesn't work on large files

[w-xy]

I have configured this in the settings.json: "editor.largeFileOptimizations": false

But it seems not work on large files (about a 720kB log file). It's good in another 48kB log file.

The latest VSCode and extension version. Computer: Win10 Pro 21H2, 8GB memory.

Thank you for your attention.

[w-xy]

Sorry, 720MB and 48MB