Input lag when playing VST instruments

Help me with this one. Not sure where to adjust this. I didn’t have the same problem in Cubase5 so I have no idea where/how to adjust this.

In C10 I get a 1/2 sec delay/latency after note is played on my keyboard when I load any VSTi (like Halion 3).

Same PC, drivers, everything. I only upgraded Cubase.

Do you have any plugins on the Stereo Out that could be introducing latency?