If the blade is just a steel one you can do a quick touch up on with a file to sharpen it regularly which will give a nice clean fast cut and the motor will last a lot longer. Heat kills motors.
If it's a carbide tipped or equivalent, even taking a few minutes now and then to take the buildup gum from the teeth will do a world of good.
I have a device that I install on mine periodically to true the blade. I bought it from Lee Valley but they don't list it anymore 2 bad. It is fantastic.
You put the blade in the arbour then you put this device in next to it then bolt it all in as usual. Then you run a runout gauge on the blade to measure the runout.
Then you simply turn the blade to the spot of the greatest runout and screw the set screws in to flatten the blade. You keep on going around the blade till you get the majority of the runout out.
Then you run the blade for maybe 10 seconds, then turn it off and remove the blade flattener and reinstall the nut as per normal and you have a blade that is awesomely flat, quiet, smooth, no tearout and the blade stays sharper longer because all the teeth are cutting.
The thing is dead simple to make it you are a machinist :) as it is just a disc (relieved on the blade contact side with a bunch of small setscrews.