Rift has implemented MultiCore Support (See This article). While this works on some computers just fine I had an issue with New MacBook Pro 2017-18 with Dual Graphics Card (Radeon Pro and Intel HD). When turning on MultiCore support for graphics the game starts to stumble.
While this might work with some computers on the MacBook Pro (New) / Have not Tested with ones with Intel on it (But will at some point). If you turn the Multi Core support to Single Core Support it will now fly through graphics at all the settings up to the Max.
NOTE: Please note that if you use the DEFAULT slider in RIFT it will set the settings for you automatically for Core Support.
This could be a problem with the emulation engine.
This was tested on :
Radeon Pro 555 2048 MB on MacBook Pro (15-inch, 2017)
MultiCore Support Off - Graphics up to Maximum - Runs Flawlessly
Intel Iris Pro 1536 MB on MacBook Pro (Retina, 15-inch, Mid 2014)
MultiCore Support Off - Graphics up To Maximum - Runs Very Good
If you full around with the graphics settings to lower some things, this will run smooth as well.
NOTE: Addition (2018-09-28) as of September of this year this might work for a number of laptops either fixed by the Game itself or by the CodeWeavers Cross Over 17.5.1. If you are running 17.5.1 this option might not be needed by you.
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