I have Geoserver installed as WAR in Tomcat. My html/openlayers files are served from the www folder of /webapps/geoserver/data and I had "beautiful moments" experiencing WMS from there.
The problem is this: Each time, after working nicely and smoothly for only minutes, GeoServer user interface becomes too slow and get blocked. When I want to edit sth I get msg like "The session has expired..." So I need then to force the "org.apache.catalina.bootstrap" to quit as it doesn't respond to "/Library/Tomcat/bin/shutdown.sh" command, then I restart it "/Library/Tomcat/bin/startup.sh". This didn't happen before, but I don't know what I did that caused such thing.
Also I don't think it's related to WFS because I've tried this and it worked fine: