Kind of a double post. I posted earler about this but can't find the post
using OE and can't send a repply using google.

In summary: Cat 4.11s cause a major frame rate drop in GTR, Cat 4.9's don't
but cause some micro-freezes when exiting pits.

Thanks Dave Henry for the tips. Cycling the cars make's it better, but the
micro-freezes are really not a major issue as they only happen when existing
pits.

New 4.12's are out, will try them (no mention of GTR under "Fixed in this
Driver" though...).