Even with the lazyloading (I just upgraded from 1.480.3) the startup of my instance is slow (~20min). After that it makes a long time (~10min) to display the UI (I'm using the dashboard plugin)
here is a first Threads Dump while having a white screen : https://gist.github.com/aheritier/6363143
Discussing on the ML jglick proposes this :

Related to a performance fix in MavenModuleSetBuild.computeResult, but
that is not really the cause. Probably FingerprintAction.onLoad need
not call .compact synchronously; that would I think save a lot of
time. File it.