Why is RecentChanges very slow?
Are you using RCSFileProvider or VersioningFileProvider? If yes, then the reason is that JSPWiki has to go and find the author for each page separately. Especially with RCSFileProvider, this can take some time. The solution is to enable the CachingFileProvider, which keeps a list of recently used pages and author information in memory. In JSPWiki 2.0 this is enabled via the ‘jspwiki.usePageCache’ configuration option.