3ivx_dec.dll is a 3ivxCore
belonging to 3ivx MPEG-4 5.0.0
from 3ivx Technologies Pty. Ltd.
Non-system processes like 3ivx_dec.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.