Upgraded from NIS 2009 to NIS 2010, now it runs so much slower

After upgrading it takes about 3 hour to make the full scan on some 600,000 files.

Before it took about an hour. I'm very disapointed.

And I can't workm while it is scanning, everything freezes, it works only if nothing else works.

 

Second new problem : Norton did not save my blocked list on the upgrade,

So now I'm getting mail from old blocked spammers, and lots of new ones appeared from nowhere

Now I have junk mail all the time. I hadn't have this problem for ages....

 

I read good things about NIS 2010 before upgrading, and Im quite disappointed now.

Can someone give me some tips?

For improving the scan time, and not being so havy on the computer, and to avoid all that spamming.

I left all settings as given.