On running "hot", the 020/200t is a poor design. It gets stuffed full of junk around the cylinder to the point it can barely cool at all. I see 4-5 of these a week and they are all packed, and worse, the heat from the cylinder melts the resin/wood junk on the fins making a tough epoxy like covering.
Take the two covers off (real easy), blow out the junk, and dig it out around the cylinder base every week or so of hard use. Obviously if you're not cutting pitchy wood, you have less of a problem so gauge your maintenance need on what you're cutting.
Hot and poor design or not, these saws are amazingly bullet proof. Unless the air filter is shot or the saw run without one, I never see a bad cylinder/piston/bearings, and many of these saws are beat up beyond belief with 1000's of hours of use.
One thing that causes (sometimes intermitant) poor high end performance, or a "lag" on accelaration when cold, is the impulse line. It's just a piece of fuel line (Stihl really good fuel line, not the aftermarket stuff) that with heat and time get's flattened a little where it enters the engine cover. The fix (from Stihl) is to take out the hose, drill out the plastic case square hole with a 1/4 inch drill, and put in a new hose.
