Ok, the problem might be that Rack is using the built-in GPU instead of the discrete GPU, which is a common problem in Windows since they introduced the crazy dual-use GPU thing that nobody can manage right. Try this:
- In your computers’ BIOS/SETUP look for a setting that says something like “always use discrete GPU over built-in GPU”.
- In Windows and/or your Graphics card control-panel thingy, try and find a setting for the same, to force the GPU used to always be the discrete one, or at least pin the Rack application to always use that one. It’s very likely to make a big difference to the CPU consumption of Rack and thus heat and noise.
Other performance tips:
- Don’t run the engine with more than 1 thread, unless you absolutely have to (Engine menu).
- Don’t run the sample rate at more than 48K or 44K.
- Make sure selected samplerate in the audio module and the engine menu is the same, select “auto” in the engine menu.
- Try lowering the framerate in the view menu.
- Set the buffersize in the audio module as high as you can to avoid audio crackling/breakup and get better CPU usage, but as low as you need to get good enough responsiveness with e.g. a MIDI keyboard, if you use one of those.