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This is a really simple trick, but you have to enable it on each game that you want to improve the performance of. Here’s how to do this:
Quit the game if it’s currently running and with Finder navigate to the Applications folder and find your game.
Select the game and press ⌘ Command + i to open the file Info for the game app.
You can also right click the file and choose "Get Info" from the menu.
Check the box for “Open in Low Resolution” and close the Get Info window.
Effectively, this game will now start in a lower resolution.
In "Retina" mode, a game starts in 2880 x 1440 or higher, which can significantly impact game performance.
In the "Low Resolution" mode, the game will start in about half that resolution - meaning: 50% op width, and 50% of height.
In the lower resolution you'll notice a significant speed boost for your game.
Source: OSXDaily
Note:
Steam users, even though the screenshot suggests otherwise, might get disappointed.
Steam does not add games to the Applications folder, instead make sure it places a shortcut on the desktop (it might already have "Low Resoluton" checked and it might even be grayed out and checked).
