> Err, sorry about that. I somehow forgot the proper designation of computer memory. :P

> Anyway, yes, it's 120,000 KB, now that I've checked. For specifics, it's the Page File Usage that's being overworked so badly. Anyway, is there anything I can do about it?

Yes. But it shouldn't be a big problem, as all memory of XML can be paged out while RA2 is running.
You can also skip the deactivation of the mod and run the game directly the next time.