When Control or Command is held when clicking to show a plugin window in the Mixer it shows up right away. It’s better if it always opens without a delay.
Above demo shows “Ctrl” under the cursor if it is held. Only then the window shows up instantly.
I have tried this and have the same faster results.
I agree
+1
Sounds related to this topic from the CB8 forum.
Regards. 
That response in the old forum is the same as mine. What could this possibly solve that is worth defying everyone’s wish for a responsive application?
If it’s for dragging, there doesn’t need to be a delay. It just has to respond on the release of your click. Or don’t make it draggable on the part of the buttons. (Chrome does it like this with the X buttons on tabs.)
Yes, this is weird and 100% unnecessary. No delay is necessary when opening up a plugin…just open it immediately! Little things like this help make Cubase feel a little slow.
+1
This was recently posted as an Issue: CTRL or Shift Clicking on the "e" opens Plugins Faster than with Mouse only - Cubase - Steinberg Forums
Not sure which category is best here.