I've bit the bullet and upgraded to v12 and noticed that the new rendering engine introduced a minor lag or delay when hiding the plugin. I have tested it in Studio One and Reaper, and the lag is present in both of them. Then I have tested with R11, there it closes immediately, no lag at all. During this "lag" both the host and the RRP gui is "frozen".
I have also tested with closing via host keycommands and the plugin window close button, but didn't make a difference.
This is a minor thing, it only affects the graphical rendering, audio playback is totally fine, I'm just curious if it is a known behavior or something on my side, maybe video card related. I'm using a Lenovo laptop with an AMD CPU and it's integrated graphics chip. The OS is Win10.