Cpu incrases 10x with vst gui open

[Scrubbing Monkeys]

Hey guys. This phenom is not new but ran across it again recently. I am using Reaper 7.19 Win 10 on a I5 dual core laptop.
The culprits in the past and still are Waves Codex and Elements. Now the latest....Primo amp sim.
Is there a setting somewhere that can eliminate this?
Gui off....2-3% open gui 20-30%

[mjolnir]

I don't know how to affect VSTi CPU use, but I do know that the more Reaper meters there are, the more CPU use.
So I turn off all the meters except for simple channel LEDs. And I don't need all of the all the time.
Most of the time I'm in arrange mode instead of mix mode. Also I turn off some meters for the master stereo track. It actually helps me on my Linux system to do this. I ran some tests also. A few other things that I do:

* freeze to audio ASAP (audio seems to use less CPU than VSTi MIDI)
* turn off internet while working
* even set monitor to 40 Hz instead of 60 Hz (not sure if it helps or not)
* avoid VSTi's with 96 kHz audio samples

I hope this is helpful.

[Scrubbing Monkeys]

Yeah this only hapens when opening the gui of the plugin......and only in Reaper

[lfm]

Have a look at various settings for threads, plugins and stuff in Reaper, don't remember all what they were called.
- run plugin in separate thread/process or similar
- anticipative thread allocations or various things, whatever name was

If it is particular plugins there might be a cure like that.

Just try some of these kind of settings.
- trial and error

I ran Reaper last a bit at v4.7 which is a long time ago, so might be even more to pick from these days.
- maybe target individual plugins too