I tested recording on my system. With the console fully loaded all 32 channels armed and loaded. I had no issues tracking 26 mono channels and 3 stereo channels. Was no way for me to reproduce your issue.
I track to a ssd with 512mb buffer and I use the 32 bit sound engine. Looking at your video, it dosent seam that cubase and your OS bother to “spinn” up your disk at all.