iMac 2011 27", 12 Gb, AMD Radeon HD 6770M 512 MB
Running client 1.0.37 with 10.10.5 and it was all very good (usually 60+fps).
Upgraded to 2.0.1 and I had issues where various graphics - buttons in the garage, rocks on the map - weren't visible.
Rolled back to 1.0.37 and it was OK for a bit. Until the 9.17 update.
Got severe CPU issues - <20fps, CPU 150-200%.
Tried upgrading to 10.12. Improved it a bit but still severe CPU issues. With 1.0.37, it sometimes runs fine, and sometimes is horrible.
Performed complete uninstall / reinstall before 10.12 upgrade. This didn't help either.