Part of macOS
CVMServerGraphics compiler
○ Leave it
Prepares graphics code for older apps and games.
What it is
Compiles graphics code for apps that use OpenGL or OpenCL.
If you stop it
macOS starts it again straight away. Leave it.
The verdict
○ Leave it. Part of macOS, or something that starts again by itself. You never need to close these.
In Activity Monitor
CVMServerCVMCompiler
From Procession’s guide, in the words the app shows.