Hyper Cache is specifically written for people who have their sites on low resource hosting providers. This plugin will make an enormous speed improvement and is recommended instead of other similar plugins such as WP Super Cache or W3 Total Cache. It will work better with BuddyPress and is quite simple to set up.
The problem was with the DB Cache Reloaded plugin. Not only would the notifications not go away but when individuals submitted anything on a wall or activity stream, this would not be published for several minutes. When I removed the DB Cache Reloaded plugin, the problem went away!
However, every additional plugin you install will need to request information from your database and the cumulative effect of having dozens of plugins is that your site will slow down. Use only the plugins that you actually need. Try to remove the rest.
The base templates that BP looks for in order of priority are:
plugin-buddypress.php
buddypress.php
community.php
generic.php
page.php
single.php
index.php
If you are on a single group page, BuddyPress will use the following template hierarchy:
If you are on a single member page, BuddyPress will use the following template hierarchy: