Multiple instances of csounds or single instance more performant?

I was just thinking about something recently and realized I was not sure about the answer. Typically I tend to have a single instance of csounds and to have many instruments within it, even if communication between the instruments is non-existent and they are externally triggered.

I was curious, is having multiple instances of csounds going so that instruments run independently, say when being trigged by MIDI better? Does this allow the other instances to potentially run on different threads, which could give a boost to performance?

Thanks in advance for thoughts/insight

This is effectively how Cabbage works when people instantiate lots of plugins in their DAW. Each plugin instance owns and manages its own instance of Csound. My gut says it’s more efficient to use just one instance, but I have done no benchmarking to confirm this.