eGPU on Mac makes AE extremely sluggish and laggy
I added a Radeon 5700XT graphics card in a thunderbolt eGPU enclosure to my iMac Pro. This has been supported in macOS since 10.13 High Sierra. I am now running 11.2.2 Big Sur, with the current version of After Effects. We all know it's too much to ask for AE to utilize this extra GPU power, but can I at least run the program normally? I cannot even get a smooth RAM preview while having the eGPU connected. The checkbox to "Prefer External GPU" in the get info dialog does not change anything. In fact it seems worse when I force AE to prefer the new GPU. This is extremely disappointing and frankly unacceptable. Mac users finally have the option to scale up GPU performance (I did this mainly for 3D rendering acceleration), and it ends up making After Effects SLOWER. Adobe please, please, help us professionals out with solid code and not new features. Thanks.
Nick Hess commented
Thanks for the info Patrick, I am running my iMac Pro at a scaled resolution. I'm going to do try that and see if it gets better. No scaling at all would mean I have to run at 5120x2880 which would make the UI tiny. But maybe the even math at 2560x1440 would also work. Regardless we still need a proper fix from Adobe.
Pierrick vauvelle commented
For me (mbp 16" i9 + eGPU rx580) the solution for smooth preview and UI was to run my monitor at full resolution without scaling, as soon as I use any OS scaling I get laggy ram preview and overall laggy UI.
I have two UHD 32" displays, the UI becomes a bit small without scaling but I get more stuff on the screen at the same time