some performance numbers (test code is here http://pastebin.com/f6ead5a8a). I simulated doing a ConcurrentHashMap lookup with ScopeKey used as the key. From a single thread, I performed 3161899 * 5 map look ups to see what the performance implications are of the ScopeKey modifications. Test run 1, original (current) ScopeKey implementation: 6058ms 6118ms 6016ms 6047ms 5952ms 6061ms Test run 2, ScopeKey is implemented using ConcurrentSkipListMap and using getOptimizedKey for both Map key insertion and Map lookup: 496ms 498ms 524ms 514ms 524ms Test run 3, ScopeKey is implemented using ConcurrentSkipListMap but getOptimizedKey is not used: 1233ms 1553ms 979ms 937ms 2229ms Test run 4, ScopeKey is implemented using ConcurrentSkipListMap and using getOptimizedKey for only Map key insertion. Map lookup is using ScopeKey (probably slower due to mixing different object types in equals()) 3815ms 3225ms 3978ms 3914ms 3201ms Test run 5, ScopeKey is implemented using ConcurrentSkipListMap and using getOptimizedKey for only Map lookup. Map key insertion is with ScopeKey (probably slower due to mixing different object types in equals()) 2754ms 2994ms 2938ms 2851ms 2777ms View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4251048#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...