Profiler analysis of AS bootstrap in
JBAS-5224 shows a lot of time is spent in VFS methods.
Look in particular at: http://jira.jboss.com/jira/secure/attachment/12320206/as5_hotspots_20_may.html
One direction is to try to reduce the number of calls to the VFS methods from the callers, so this needs to be handled elsewhere.
But another goal is to improve the execution time of the hotspot methods in vfs, e.g.
PathTokenizer.getTokens are called about +330k times in beta4 and ~600k times in trunk.
AbstractVirtualFileHandler.structuredFindChild has the same increase in calls as PathTokenizer.getTokens.
AbstractVirtualFileHandler.checkClosed have increased from ~1.4million calls to 3million calls
MatcherStrategy.subtypeOf have increased from 500k to 680k calls.