I am using JBOSS Developer studio 3.0.1 GA and I find that the build sometimes just hangs in 78% or 98% or is extremely slow. I have unchecked the 'build automatic' option and also unchecked many of the validators in the Validation menu. This usually happens if I am opening the workspace after a 2 days gap, do a change and build or if I close one workspace, open another or switch to another workspace, do a change and build. If I am continuously working only on one workspace, then anytime I do a build, it is fast.