swg.dll is a Browser Helper Object
from Google Inc.
belonging to GoogleToolbarNotifier
which is a companion to the Google Toolbar.
Non-system processes like swg.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.