Hi. I had a lot of problems with sluggish controls and bad performance in Unity engine based games AKA Assassins Creed especially Syndicate and Unity. I eventually put in a support request which you can see below. Bottom line is Saitek/Mad Katz went bust and the drivers for their mice and other products are well out of date. It turned out the Profile loader which has an icon in the system tray was interfering with Unity engine mouse and keyboard controls. They were slow to react and sometimes there was no reaction. Removal of the utility running in the background solves the problem. I thought the camera in AC Unity was setup in a weird way being sluggish and generally slow to react. All along it had been this problem !
This may be a classic case of old drivers but Saitek/Mad Katz were problematic all along, probably one of the reasons they went bust along with outrageously over priced products. Removing the system mouse driver for the R.A.T. 5 mouse means that left click no longer works on the mouse ! It’s obvious that any mouse should be functional with the default Microsoft mouse driver or whatever default driver is installed. I just ordered a new mouse from a manufacturer that seems to be financially healthy and has recent driver releases.
This problem may effect other games as well and in ways that may not be immediately noticeable. For example I noticed improved frame times in Syndicate after solving the problem. That’s the accuracy of the time between each frame.