NIS2009 SLOWS FireFox 3.0.5...any settings to help this?

Hello ALL:

 

I installed NIS2009 on 2 systems and all seems OK. However, Firefox seems slow while browsing. I realize that NIS2009 has some internet protection, but I did not expect to notice the slowdown. My options are still at the install defaults so I wonder if there is something I should be setting to help this.

 

TIA