I have always been a big fan of optimizations in regard of page speed.
I noticed that there are many *.JS files which are being loaded even for guests which are not really needed in my opinion.
I think some users and site admins would prefer a better SEO over a (for example) fancy POP-UP for guests. Of course these options are great for user experience but this has meaning when the USER is logged in.
What I have done to my forums was hiding all *.JS files for guests user group using conditional tags.
Since not many users are not comfortable editing templates one by one , so having an option like "Disabling Fancy -or- *.js files for Guests User Group" would be a great idea.
By disabling the JS files I was able to reduce the page load time for a bout 2 seconds.
Here are the results :