btstac~1 is a process that belongs to the Bluetooth Stack COM Server from Widcomm Inc. This process is needed to ensure that the product above is working properly.
Non-system processes like btstac~1 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