ambimapi.dll is a AMBIMAPI
belonging to 8Signs Firewall NDIS driver library
from 8 Signs Ltd.
Non-system processes like ambimapi.dll 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.