Some good answers thank you.
My saw has only one speed, it's cheap. I mentioned speed as in my feeding speed.
I have tried different blades, but still need lots more practice to learn which blade is best for which jobs.
I always tension the blade as much as possible, sometimes overtight. Again practice and patience.
Here's a very rough idea of what I'm trying to get across, it's not the fuzzies more the quality of cut. (My cuts aren't this bad or I'd give up 😄)
I'm using a 9mm birch ply here, not Baltic, and don't think the quality is very good.