First off this is amazing. Way better then the SI mod that we got earlier this year. That said you will need a beefy PC if you decide to max out the options. Particles really gives your FPS a a massive drop. As does messing with Grounded Search Distance and Update Time.

Here are the settings I am enjoying so far with my PC:
Mac Particles 3
Particle Multi 2
Process Distance 100
Grounded 4
Grounded Weight 400
Soft 189
Medium 189
Hard 189
Update time 924

It gives me something close to the older SI mod, but seems better. This also seems to make buildings not instantly turn top billion of pieces when they go to fall (like if you shoot out the bottom floor). Only some of the building crumbles.

I did test the mod with max settings and it only took about 5 seconds for my FPS to drop to about 1 FPS. Unlike you got a super computer, don't max it out. Granted the worst that happens is your game simply crashes. I am also using TD_Office to test on as its a smaller map, but still has a tall enough building to shoot.