Yes it does sadly, even with the 1.21 patch.
I have huge issues running the Vee with a full grid of 33 cars at most tracks I've tested. No other car in GSC-E causes frame rate issues like the F-Vee does, even with 33 cars on track. FWIW, my PC should make light work of GSC-E (i5 2500k, EVGA GTX 680 & 8GB RAM).
I'm using the Spielberg Historic track as the basis for testing the frame rate; solo driving with the F-Vee (no AI), I see as high as 390 fps; with 33 AI cars the framerate is as low as 20fps just sitting in the pits.
I change vehicles to 33 of the 2014 Stock cars, F-Extreme, F-Reiza, Mini's etc and the frame rate remains well above 140fps in the pits or out on track or a constant 60fps when v-sync is used.