I finally updated to High Sierra today, because Apple broke GPU frame capture in a recent Sierra update and then declared they had no intention of fixing it when I filed a bug report. After updating, my Metal app runs less than half the speed than it did in Sierra. This is on a late 2012 iMac with an NVIDIA GeForce GTX 680MX 2 GB.
Anyone know why this is? Have I now got to wipe my hard drive and go back to Sierra to get my app speed back? I looked on the NVIDIA site to see about drivers, but I don't think Macs even work with separate graphics drivers.
Thanks
Bob
