The Kapex has a universal motor and so speed control is accomplished by reducing the voltage. If you are perceiving a slowness, it may be worth checking the voltage level on your circuit.
The Kapex is like two different saws from 15a to 20a circuit. Sometimes your stuck with a 15a, gotta do what you have to do. It's one of the only things I hate about the Kapex is how fickle it is about needing a 20a circuit.
The Almighty Kapex 120, ETS 150/3, DTS 400, CTMidi,, Sys-1 Box (2), Sys-STF D125, Sys-Vari, Compact Cleaning Set, 1900 Rail, TS55r, CXS, OF-1010, MFT-Mini, MFT/3