6.200 Surf Protection/web browsing too slow

Hi
Running the proxy in standard mode.
Antivirus scanning off
IDS off
One default surf protection profile.

Although the system works, web browsing is too MUCH slow.
When the Surf Protection is disable, web browsing became very fast.
Hardware details
HP Prolaint DL 380 G4
4 X Intel(R) Xeon(TM) CPU 3.80 GHz
3.5 GB RAM

Please Help.

Thanks

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