ravcpl64.exe is a RtHDVCpl.exe
belonging to HD Audio Control Panel
from RealTek Semiconductor
Non-system processes like ravcpl64.exe originate from software you installed on your system. Since most applications store data in your system's registry, it is likely that your registry has suffered fragmentation and accumulated invalid entries which can affect your PC's performance. It is recommended that you check your registry to identify slowdown issues.