I did come from Cubase 6 and that was even not so good used and actually came from SX3. To C9.5 update now seems to work without errors or crashes. Though i had C9.5 stuck with the Jbridge 32bit plugin i think and cubase froze up because i rightclicked in a 32bit plugin. So for me now the most important is that C9.5 did not crash yet and no errors. Thought i had my moments.
Just like Halion 6 is like, the main thing is with C9 a new look and workflow that i like. Maybe i did not work with C7,C8, i still would prefer C9.5 above and would start C9.5. But for backwards Projects, i just did an SX3 project and could import it into Cubase 9.5, it needed some work but it runs the same as it would in C6or SX3. The main drop is 32bit plugins must use Jbridge, and that was the only hickup i had with C9.5 until now, i rightclicked into the plugin window and all froze. As far s speed the main problem was Midi Timing, and that improved to allmost so good, that i did not notice even any midi timing problems. That means from my external usb midi keyboard, controller, or any internal C9.x plugins processing. The most important is that Midi Timing and Latency are really smooth and fast, even with heavy load plugins etc. The timing stays. That is the best improvement i can say coming from C6, C9.5 runs and is not crashing and runs smooth.