memory leaks

when i try it with > 100kb files, it almost always gets to this message:
- FATAL ERROR: JS Allocation failed - process out of memory

it also runs long time, before showing this error (few minutes). Would it be possible to process diff with multiple child processes. Every child would process part of html, use less memory and we would utilize multiple CPUs (since all servers nowadays have few processors).

Or some other memory handling, to prevent leaks? Otherwise, great code, very usefull!