I had the same problem, go to windows update and do all updates,should fix it. If they don't work go in cmd prompt and type wuauclt.exe/updatenow wait a few minutes and then go on windows update and...

Made my pc update and lag seems to be completely gone! :)

Note: Tried using Windows Store apps but had exact same problem, also tried Xbox app to stream and still same problem?!?!?!?! ��

I updated a few days ago to W10 and now whenever I try to use any games eg TS4 and other downloaded games they are EXTREMELY slow even on lowest quality and are unusable. Before I updated my pc I...