NIS 2012 and lost network speed

Some question about network speed optimization.

Before.

2 PC, Windows 7, connected via gigabit switch ipv6 Homegroup share

Speed to upload\ download - ~ 90-100 MB\s

After installing on both PC NIS 2012. ( both PC in Full Trust in Norton Network Security Map)

Speed to upload\ download - ~ 45-50 MB\s

Is there any possibility to see the future development and optimization for NIS filter drivers to work fast as default Windows firewall?

Thanks.