yeah, condor outperforms slasher actually
the top 4 in builds i figured out with my current skills:
1) executioner: 3672/3.5
2) atron: 3642/3.6
3) condor: 3574/3.6
4) slasher: 3518/3.6
The thing the Condor has going for it, is that it's got the lowest inertia modifier of all frigs: 2.62 and one of the best base speeds (404)
Although the base speed of the Slasher is higher (419), the inertia modifier is 2.83, so to make it both agile and fast, you have too much inertia to compensate for.
The Executioner is actually at the bottom of these two figures: it has a base speed of 404 and an inertia modifier of 2.89. However, this boat has 2 low slots, where both the Condor and the Slasher only have 1. -> Executioner wins.
The Atron also has 2 low slots, but has a slightly higher IM than the Executioner: 2.92. Enough to nullify the advantage of higher base speed (409). Atron comes in 2nd therefore.
Of all frig hulls, I think the Claw would rule all, with the best base speed (475), the lowest innertia modifier (3.09) and the most low slots (4).