It is looking like some missing optimization that was removed from RC release.
Thanks. Is there some discussion of why these optimisations were removed? I started looking at some of the more complicated queries I do and there are many occasions where there are 10-30x performance degradations compared with the RC. Not what I was hoping for with a much more powerful machine! Were these optimisations really dangerous? Is there any (easy and safe) way to get them back or would I need to reinstall an RC version?