Decrease Memory, CPU Usage and Startup Time of SEP Client

Hi,
I have used Symantec Security products for the passed few years. Symantec Client Security 2.x still run fine on my old Pentium 4 Desktop. It works well and doesn't really slow down my system on startup and overall performance. My computer PF Usage is about 200+MB and CPU Usage is less than 20% on startup. (Startup Scan Disabled)

But from Symantec Client Security 3.x to SEP 11.0.2, it really slows down my system on startup and overall performance. My computer PF Usage is about 300+MB and CPU Usage stays at 100% for about 30 seconds before it decrease. (Startup Scan Disabled)

SEP 11.0.3 - SEP 11.0.5 is slightly better, it slows down my system on startup and overall performance, but not as bad as SCS 3.x to SEP 11.0.2. My computer PF Usage is about 240+MB and CPU Usage stays at 100% for about 15 seconds before it decrease. (Startup Scan Disabled)

I would greatly appreciate if Symantec can make a security product that use less memory, cpu usage, lower performance impact and faster startup in order to run well on older systems as well as new systems.

Best Regards =D
PeterTWJ.

Software tested with a