My performance hasn't really changed. Running 500+fps in offline, 200+ in 6s and ~150 in pubs with a GTX 1060 and i7 6700k with cowmanglia's dx9 config.
Did you make any changes to program settings and/or installed anything since the update that could be affecting performance?
If anything else fails you can try using different configs and look up tutorials to increase FPS in games.
Edit: also look at your CPU and GPU core temps, maybe they are thermal throttling for whatever reason?