I am using i9 9900k @5GHz so I think it is quite fast. The plugins I use are CPU heavy and you can run limited number of them on a single core. I am not interested in low latency - I am running 1024 buffer, however I would like my projects to play smoothly even if there is latency. Ableton unfortunately does not work well with such use case as it won't parallelise where it could and sandboxing does just that and I can run more plugins, even if it seems less efficient.
For other readers: It is a misconception that sandboxing per-se enables parallelism. On the contrary, it only hurts performance. The speedup observed with jBridge might have other reasons. More here: https://news.ycombinator.com/item?id=25068976
