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Every saw is going to bog down some when cutting. What condition is the blade? I would need more information on what kind of saw it is in order to try and help. Is this gas powered? Wet saw? Wood, concert or steel?
Check the brushes for the motor. very common problem in electric motors. It should look like a slotted head of a screw on the side by the motor. Only its plastic and about the size of a dime. After removing the brush, or magnet is what it actually is, replace it. Very cheap to replace and most hardware stores carry them. Hope that helps. Otherwise the switch is bad
The problem could be bad brushes. Otherwise, you are probably burning the windings inside your motor. The slight banding noise could be an issue with the bearings in the motor itself. In which case you will soon be replacing the motor, so... we'll hope the brushes prove bad.
Assuming the motor has brushes, there will be 2 semi-large buttons on the motor (one on each side). They are screws. Remove them and beneath each one is a "brush". They should be long, hard, crack free, and smooth on the bottom where they touch the rotor. If not, then replace them. Almost all motors used for tools have brushes and some motors require disassembly of the motor itself to replace the brushes, but in your case, it should be an easy job. I can see one of the buttons on the Amazon picture.
Never heard of cutting steel with a chain saw. What works best for me has been a sawzall with a good quality steel cutting blade. The real thin metal cutting blade on a circular saw works pretty good also.
High Speed Steel - Used for wood and light metal cutting
Bi-Metal - Also used for wood and light metal cutting.
Cobalt Steel - Tougher and lasts longer than Speed steel and Bi-Metal. Used for wood and metal.
Carbide Grit - Strictly used to cut masonry board.
Scrolling - Thinner than the regular jig saw blades and are used for tight turning cuts.