I tried this roughly 2-3 weeks ago and found a lot of the same issues. Using it was extremely slow and it consumed a great deal of system resources. While it might help with database schema, one thing I like about intellisense generators is that they save me time in typing out long lists of columns, etc... This one definitely didn't. While I've been a huge fan of Red Gate's products in the past, I think this one needs to mature a little bit before I'll get all that excited about it.

Not to hawk another product here, but I was using ApexSQL Edit for a while which has similar functionality and seemed to be better performing. However that product had its own problems with memory leaks and stability in other areas. I'm wondering if they've fixed those yet.