I am also having this problem.
Just upgraded to the intel optane 905p SSD (fastest SSD on the market, esp. at random reads and writes) with a fresh install of windows.
I can load 50 Firefox tabs, itunes, a game, etc. before Display Fusion starts on its own.
Not having the multi monitor taskbar until a good few minutes after boot when my system only needs 5 seconds to boot is quite a pain in the ass, especially since all of my quick launch shortcuts are on my second monitor that displayfusion handles.
I've tried changing the DF service from delayed start to automatic, and even added it to the first Service Group that loads in the regsitry.
No dice.
Any ideas how to speed it up?
edit: p.s. i feel it wasn't as slow on my older SSD/windows