no PHP highlight with large files

version 504b407x64 -- problem exists since quite a few versions back, not with older versions.

I have 2 files with more than 1 MB and a lot of functions to be parsed. When loading, the beginning of the file is shown with highlighting, when loading finished, highlighting is gone.

Activating highlighting works immediately.

Program settings / direct edit button
Change value of variable;
HLUpToSize=1500000
Value means size of bytes