MC-99952High CPU when in background
Similar to MC-77633, when Minecraft is running and I switch to another desktop, its CPU usage leaps up. For example, with Minecraft running in the foreground it uses ~60% CPU. When I switch to another desktop, it jumps to 100% CPU, the CPU core temperature rises and the fans come on full blast.
I have Minecraft on what I believe are the default settings: max frame rate 120fps and vsync: on. If I reduce the max frame rate to 60fps, I don't see an increase in CPU usage when I switch to another desktop. I suspect that when Minecraft is on a non-foreground desktop, vsync no longer has any effect, so Minecraft suddenly starts using 100% CPU to try to render as fast as possible.
Ideally, Minecraft would not render at all while on a non-foreground desktop (perhaps not possible, since OSX can still show a realtime preview of other desktops), failing that it would render at a low framerate, and failing that when vsync is enabled it would not render above the vsync rate when on a non-foreground desktop.
Environment
OSX El Capitan, 13" Macbook Pro Retina (early 2015)
Created Issue:
High CPU when in background
Similar to
MC-77633, when Minecraft is running and I switch to another desktop, its CPU usage leaps up. For example, with Minecraft running in the foreground it uses ~60% CPU. When I switch to another desktop, it jumps to 100% CPU, the CPU core temperature rises and the fans come on full blast.I have Minecraft on what I believe are the default settings: max frame rate 120fps and vsync: on. If I reduce the max frame rate to 60fps, I don't see an increase in CPU usage when I switch to another desktop. I suspect that when Minecraft is on a non-foreground desktop, vsync no longer has any effect, so Minecraft suddenly starts using 100% CPU to try to render as fast as possible.
Ideally, Minecraft would not render at all while on a non-foreground desktop (perhaps not possible, since OSX can still show a realtime preview of other desktops), failing that it would render at a low framerate, and failing that when vsync is enabled it would not render above the vsync rate when on a non-foreground desktop.
Environment
OSX El Capitan, 13" Macbook Pro Retina (early 2015)
![[Mod] CubeTheThird](../../../data/assets/gravatar/cubethethird.jpeg){kind=small}
Invalid, hardware issue.
This isn't something that would be controlled by the application, as the game wouldn't even be aware if it was displayed on a 'main' or 'separate' desktop. This aspect would (if anything) be controlled by the JVM, or the libraries the game uses (LWJGL).