Fixing Unusual Lag

1. Press [Ctrl] + [Shift] + [Esc] to start task manager.
2. Switch to the [Performance] tab at the top in task manager.
3. Click on the [Resource Monitor...] button at the bottom to open the resource monitor.
4. Switch to the [Network] tab at the top in resource monitor.
5. Right click on the process you want to terminate and choose [Exit Process] from the drop down menu.

NOTE: System, svhost.exe (Network Serive), LolClient.exe, LolPatcher are the only processes required to play League of Legends, so you might want to close everything but these processes.