Thanks, Sue, but my folks need to update the data in the wiki tables regularly as they are being used as a type of dashboard.
I think I found just the trick I need for these HTML tables in the short term (until I can explore alternatives for formatting)...
On the textile site linked in Derek’s post above, once can “bypass” textile on raw HTML by surrounding the HTML with two equals signs (==).
Doing this on the two notable tables brought response to 50.4495 seconds for Recent Changes instead of 400+.
Thanks to all who contributed. Now onto that new build update…