Very slow on large files (and hangs, can't cancel)

[dardoor]

I'm trying the latest version and it's still pretty much unusable on large files (and by "large files" I mean like 10MB). It can make N++ hang maybe for hours and it's not even possible to cancel the compare process. I don't know if it's the size alone or the number of lines that causes this.

If it's not possible to fix this, maybe you can add a warning when a user tries to compare large files.