Blender 2.79 hanging badly with booleans

I work with another designer, and when he sends me files containing parts with booleans, Blender hangs up and there is a couple second delay every time I move anything in object mode. For instance, switching from edit to object mode takes about two seconds, then moving any object is basically impossible because the object hangs for a while, then jumps across the screen. Many of these files were created on my computer and worked fine, but for some reason, after he worked on them, they hang.
Any ideas how to fix?

2.79 had 2 boolean solvers Bmesh and Carve

Carve was slower, maybe he changed it? (It is modifier settings)

That seems to be it. It’s better anyway. Thanks.