Some McAfee VirusScan users may notice that right-clicking in Internet Explorer slows down when the on-access scanner is active. Workaround: Open regedit, go to
HKEY_LOCAL_MACHINE\SOFTWARE\Network Associates\TVD\Shared Components\On Access Scanner\McShield\Configuration, and ScannerThreadTimeout to (hex) FFFFFFFF. (That’s 8 f’s). The usual disclaimers apply — editing the registry is dangerous, for advanced users only, blah.