Tom,
The shortcut toggles between GPU and CPU, the former sometimes being a bit unruly.
This is what GPU is about:
https://helpx.adobe.com/illustrator/kb/gpu-performance-preview-improvements.html
GPU is faster, sometimes too fast, so it gets ahead of itself and moves in mysterious ways.
Graphics cards are included in the system requirements:
https://helpx.adobe.com/illustrator/system-requirements.html
https://helpx.adobe.com/illustrator/system-requirements/earlier-versions.html
https://helpx.adobe.com/illustrator/system-requirements-old-versions.html
Apart from an inadequate card, the issue can be caused by lack of driver updating, lack of proper recognition of the card by the computer, and whatnot (including rifts in the space time, moon, weather, and the fact that Illy (job description Adobe Illustrator, and she is always eager to help) sometimes moves in mysterious ways).
Here are a few more pages about GPU troubleshooting:
https://helpx.adobe.com/illustrator/kb/gpu-performance-errors-troubleshooting-workarounds.html
https://helpx.adobe.com/illustrator/kb/illustrator-gpu-performance-driver-update.html
Sign up
Already have an account? Login
To post, reply, or follow discussions, please sign in with your Adobe ID.
Sign inSign in to Adobe Community
To post, reply, or follow discussions, please sign in with your Adobe ID.
Sign inEnter your E-mail address. We'll send you an e-mail with instructions to reset your password.
