I remember a SWAM performance problem once has been discussed here. Now I faced something similar.
I use a live playing setup based on the Reaper DAW. Here multiple tracks are configured holding different instruments and effects. To swap the patches, these tracks are muted / unmuted by signals coming in via Midi. The system is extremely reliable (never crashes) and features no performance / latency problems running on a rather fast Windows PC (i7 4*2.1 GHz).
Usually in "play"-mode, no VST GUI Window is open, but just a standard Reaper "all tracks' sliders"-view is shown. When playing with my band, I usually don't watch the monitor at all.
Now, yesterday, I had two crashes (no reaction on patch change commands any more) within two hours, and I found that generally the system reacted on patch changes in a very sluggish way, while audio worked fine, nonetheless.
The reason was, that after some tweaking I forgot to close the Cello's GUI. After doing so, everything was back to normal, again.
Technically, Reaper is set in a way that muting a track results in completely disabling the audio stream in that track, so the plugins in a muted track don't take any CPU cycles for audio/midi, but they do for handling their GUI.
So it seems that there is a Glitch with the (Cello) Swam software maybe triggered by running the GUI while audio is switched off from the VST host.
Feel free to ask here all the necessary questions about our Virtual Instruments
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