One tiny problem…that code doesn’t use a PCA9685 board. So either you want to use one of those or you don’t. Which is it? The code will be very different in the two cases. The standard Servo library can run servos at full speed so “servos too slow” is a complete red herring.
Oh and its pointless posting code that you have never tried. You can’t compile and load code without saving it so unless you deliberately went back and deleted your original code it’s still there somewhere. Have a look under File/Open recent.