Anyone experiencing game builds running slower and sluggish on windows 10 vs windows 8?

Same file, same scene, same UE version (in fact I even tested it on 4 different versions later), I built it on windows 8.1 runs silky smooth, upgraded to windows 10 pro and now it runs sluggish and framerate dropped by at least 50%.

Yes my hardware is the same and nothing else is changed and nothing running in the background, fresh clean installs. I tested it on another machine different Hardware specs which also got upgraded to windows 10 pro and same issues there.

Anyone else experiencing this?

Edit: To further clarify the original build actually built from windows 8.1 runs smooth in windows 10, but the windows 10 build runs bad on windows 10.

*Sorry bump - No one?