Text Colors Great, Until They Stop. Fixable?

Hopefully this picture shows the problem. Text colors are behaving perfectly, except in css with long rules.

Changing themes did not affect the problem. Here it is in safe mode:

The file I am testing with is available for download from this link.

Atom stops highlighting each line after a certain number of matches on that line. This is for performance reasons, as Atom has historically had problems with large files and very long lines. There’s a solid chance that in the future Atom’s performance will improve to the point where the developers don’t consider it necessary, potentially with the finalization of the tree-sitter implementation.