This is very good advice, but not only for the reasons that the author lists. If you use a slower machine (or one with different performance, in general), you

This is very good advice, but not only for the reasons that the author lists. If you use a slower machine (or one with different performance, in general), you might discover race conditions in your code, that otherwise go unnoticed. I get this all the time with software on my mac — run stuff on a loaded machine and discover applications aren't ready for things appearing in different order than on the developer's machine.