hpw3mem.dll is a HPW3MEM
belonging to HP Printing System for Windows
from Hewlett-Packard Company
Non-system processes like hpw3mem.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.