I did everything you said,but still not working.I was play 60 fps in EC. when I updated my pc win 7 to win 10 playing 13 fps now. I think this problem windows problem or windows 10 not supporting EC
Or its because of your computer virus, sometimes a virus which disables registry editor causes fps lag in game. I had old pc with this problem, every moment I used Avast Antivirus and scanned C:/. Removed all the detected components and all done. My old pc had this problem but I fixed it many times with it.
Try Avast Antivirus and scan the C drive after all this delete the components which your antivirus detect out. Restart your pc for one time or two times. All done.
If it too doesn't work, then sorry.