Low GPU usage on 1.9

[popos1]

Hi, 

we have 2020 year and ksp version 1.9 and still exist problem of not full GPU usage:

There is any fix to get at least 25 fps?

[Incarnation of Chaos]

The year is 2020, but alas the way KSP works hasn't changed fundementally in this regard.

Your GPU is doing very little work when playing KSP; only rendering the limited graphics of the Skybox, lighting and whatever ships are in the scene. The CPU is what is pulling the majority of the load, and for individual vessels with high part counts all of this is battering a single core. Other cores are used to offload ships out of focus, so this reduces the overhead slightly for this one poor core. But that one ship is using one core to perform all the calculations of how each of those 500 parts is interacting with each other.

In shorthand; the bottleneck isn't the GPU here. It's the CPU, and only raw clockspeeds would raise your FPS at this point or a CPU with higher IPC (This may not be possible even if you're running recent HW). The "Fix" is on the user end; you now have your upper limit for partcount and can attempt to avoid using that many in the future.

[Curveball Anders]

KSP is CPU (and RAM) centric, not GPU.

Which is why it works (decently) even if you have a very modest GPU.