Aug 11, 2019 · Why your HP Pavilion Laptop is Running slow? There are some possible reasons why your HP Pavilion x360 laptop is getting slow. All Windows PC’s can get clogged up with junk files and unused applications which may cause some performance issues such as running slow, lagging and hanging. Just boot your PC and press F8 during startup. You should see an option called Repair Your Computer. Select it and press Enter to see the recovery options Windows 7 has to offer. These Windows 7 tools will help you troubleshoot and fix a slow computer in a quick and easy way.