So for the most part, whenever I switch monitor profile that involves connecting or ignoring a secondary screen, both screens turn black for about a second or two because coming back on the new profile. This makes sense and I never questioned it, it's the same as unplugging an extra HDMI cable.

However, I've had two instances now where I had to set up the monitor profiles again and one time after I reinstalled DisplayFusion, that for a week or so, switching monitor profiles was instant. Then after a while, it just goes back to normal with the one or two seconds required to switch display.

I assume that the profile switching having a bit of a delay is normal and that maybe that seamless transition is just a fluke.... but it's REALLY nice to switch it so instantly, to keep using my monitor while my second screen goes on, and I'm curious if maybe there is a way to keep it instant. At the very least, I'm curious why after doing the settings all over, profile switching is so much smoother.

I tried recreating the steps I took last time I suddenly had a seamless monitor transition, which is reinstalling DF and creating a new monitor profile, but it didn't work. I guess those two short periods where switching monitor profile was instant may have just been a weird fluke then.