KACE Product Support Question
Seriously consider if you need to upgrade to 5.5 before doing so
It is brutally slow. We're being told 3000 clients is on the high end of their scalability, because we use Smart Labels with wildcards, and run a few scripts every couple hours, that's a lot of the cause of our slowness. Everything worked terrifically in 5.4. Just as a warning, seriously consider if you need any of the features of 5.5 before upgrading at this point.
Community Chosen Answer
I was frightened of this upgrade back when it was first coming out, and even made a question in regards to it, but not having that many clients meant my upgrade went smooooth. No patches, no issues, no slowness.