I've found the pleated cloth masks work reasonably well. Some are better than others when getting sweaty or huffing and puffing huge volumes of air while riding. Generally the more pleats the better as that seems to keep them from sealing up around your nostrils and mouth only giving a small section of cloth to pull air through.

I'll use them if I'm in a crowded section. They don't slow me down, but they do make taking a drink from my bottles more of a chore. I've tried many but the home made simple two layer pleated masks seem to work the best for me. I tried some of the ones like sports fisherman use that go all around your neck and you pull them up, but they hold in too much heat. They got pulled off in the first two miles.

But if you try one and are done with them, then I'd say you aren't trying. No matter how hot it is.