Any concurrent maps with better performance than ConcurrentHashMap?

I understand that `ConcurrentHashMap` implements the backing table as multiple segment arrays rather than a single array to improve concurrent access performance. Are there any other `Map` implementations in java that've better performance in a concurrent environment than `ConcurrentHashMap`?
Do you have reasons to believe that ConcurrentHashMap is the source of your performance problems? Has a profiler showed you that it is a problem?

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