Controller lag on certain versions of windows?

[TkSilver]

So the first thing to test for is whether the lag is input lag or video lag-- which it seems you have done a decent job eliminating unless there is a video card\monitor thing with the 2nd machine that is adding the lag (like extra video processing on the monitor adding a delay)

The next thing to do is to figure out if the delay is system wide or application specific (really game specific would be the very next step but really application specific is more likely). Feel free to uae your favorite other software or game or emulator and see if the same input issue exists. If it does not then test something else just to make sure and if that is also input lag free then start checking PPSSPP for the source otherwise....

If it is system wide then I would try testing some other controller APIs since not all work the same across every version of an OS (or even the same after some updates of an OS). There might also be some weird interference from other installed programs\drivers. I personally had a weird issue with SCPtoolkit for a while that was causing Steam to do a crash loop if it was installed and it had to do with a a seperate adapter I had (and it's driver) for hooking up PS2 and PS1 controllers to USB. So Steam and SCPtoolkit wern't exactly the issue causing the crash loop.