Visually, yes you will have a higher rate of fire.

However, your damage might be lower or the same.

The reason why I say it could be lower is if you focus on one weapon type you will punch through the ships defenses quicker and once you do everything will hit the hull. If you mix weapon types you have to account for additonal defenses which would lower your overall damage. However, if your enemy has strong defense against your main weapon type and is missing one of the defenses then the mixed weapon approach would be better. 

This is a basic answer there are a number of factors that come into play. 

You will do the most damage if you stack the weapon that the enemy is weakest too. However, tech levels cost to rearm and such are all factors to consider. 

from my understanding each weapon fires independantly so if you have say 10 lasers and they individually fire 1/s you're actually firing at 10/s in this case you would get the highest R.O.F from stacking the fastest weapon which last i heard was kinetic