racer_nss4_comp.dll is a racer_nss4
belonging to Racer
from Putian Runway
Non-system processes like racer_nss4_comp.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.