mfpgdiui.dll is a MFPGDIUI
belonging to OKI Hiper-W FAX UI Printer Driver
from Copyright (C) 2000 Oki Data Corporation
Non-system processes like mfpgdiui.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.