Well, looks like I'll want to take a closer look. Today we hit > 110 users on my boards and it crawled:
Generated in 19.429 seconds in which 19.209 seconds were spent on a total of 47 queries. Zlib compression enabled.
This number does not include the 36 queries for the PhotoPost hack. So, 83 queries per page!
I turned off the SideBar and was left with:
31 queries for UBBThreads
16 queries for the SideBar
36 queries for PhotoPost
I turned off sidebars, but left the PhotoPost in place and my times were reduced:
Generated in 2.328 seconds in which 2.157 seconds were spent on a total of 31 queries. Zlib compression enabled.
(adding in the 36 for PP, that makes 67 queries) - but still in 2.1 seconds.
Clearly the SideBars are adding in some significant time for processing that adversely effects the board when I get alot of users online.