I think beta2 will address the multiple user situation.
On the performance issue, I recall seeing very early in the beta, some reports that scanning was slowed when some particular antivirus (can't recall which) was also doing real-time scanning.
You might try disabling your antivirus to see whether that changes things.
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FAQ for Microsoft Antispyware:
http://www.geocities.com/marfer_mvp/FAQ_MSantispy.htm
Here's a little more information on my experience with slow performance of MS AntiSpyware.
Unlike several others, I never experience slow startup. Rather, I see V-E-R-Y slow scan progress (just over one second per file scanned) and heavy CPU utilization (well over 50% total on a P4-3.0 with hyperthreading enabled), but **only** during scheduled scans. If I abort the scheduled scan, then immediately run a full scan manually, it completes in about ten minutes.
One other oddity I noticed: although I had set up and scheduled the application under my account, today I noticed that it started (apparently from a previously-scheduled attempt) under the other account on my system while I was active on my account. At the time, the other account was logged in. Both accounts have full administrator privileges.
At first, I considered moving the startup for AntiSpyware from HKLM/.../Run to my account's HKCU/.../Run registry entry, but I don't believe that would have any effect other than to require that my account be logged in in order to start it and schedule automatic scans. It could - and probably would - elect, under whatever whim it might be choosing, to run under the other account if that account were logged in.
Sure hope Beta 2 addresses this issue.
- John
I just noticed that Spyware Beta1 is running a good (or is the proper adjective, "bad"?) order of magnitude slower now than it was a week or so back. Is this due to vastly extended spyware definitions? Something else?
- John