The problem is even worse on OSX systems. I have talked to many mac users (including myself) and we now see an average of 30 FPS consistent, and when it freezes it goes down to 10-20 FPS. This needs to be fixed.

The new version (.17.2) absolutely ruined everything. Now even if you turn off wait for GSync, FPS is now at 30 (from the perfect 60 beforehand). It is so unplayable....

Hi guys, I sent an email to the dev team and Scott responded with the following:

"We will be looking into the issue and releasing a fix as soon as possible"

So they know about the issue now, all will be well (hopefully).

I would suggest you start sending some private messages to the devs on these forums and contacting them on twitter. They need to prioritize this over anything else as this bug literally removes a whole chunk of their user base (probably 20%) from being able to play the game.

This needs to be fixed ASAP above all... All the mac users now have an unplayable game on their hands (assuming they want to play .17)

I concur with the above. I am using a macbook pro, latest version of OSX, and I have all the issues described above.
The best and easiest solution is to let us choose a resolution, the native resolution is too high and is buggy because of the retina display.