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Cutting metal requires pressure to make the cut. This is very obvious when drilling or turning. Without pressure a drill won't cut which is why drilling manually ytakes longer than on a drill press. When turning, we see deflection of the part due to the cutting pressure. The deeper the cut, the greater the pressure and the deflection.
For a saw blade the applied force is divided between all the teeth in contact. If you increase the number of teeth, the pressure per tooth drops and it takes a smaller cut. If you increased the pressure per tooth to equal what the thinner stock sees by increasing the force, it would cut just a quickly, assuming you have the horsepower to move the blade.
For a saw blade the applied force is divided between all the teeth in contact. If you increase the number of teeth, the pressure per tooth drops and it takes a smaller cut. If you increased the pressure per tooth to equal what the thinner stock sees by increasing the force, it would cut just a quickly, assuming you have the horsepower to move the blade.