Why is my phone faster on power-saver mode? Is there a guide I can follow to troubleshoot this? My phone is faster in power saver mode, sometimes it's like night and day. I suspect there's a background app but I don't know how to check that. I've looked around and I can't find any definitive evidence something is causing the slowdown. I don't see any downloads going, or updates, and I don't leave apps open I'm not using.