I honestly don't know how current or relevant that admonition may be. My understanding, too, is that the “sticky bit” is an anachronism now.

My experience has been that most operating systems these days are very good at caching file-buffers on their own. So the first time you run a program, it takes a little longer than it does for the rest of the day. But if you run a bunch of other things in the meantime, it takes a little longer again.

So, maybe the best thing to do for you is to just experiment. Try it both ways. And of course, “if it's not really hurting now, don't bother.”