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UDP
    network bottlenecks and 
    resending packets on congested networks 
    sockets 
unicast messaging 
UnicastRemoteObject class 
Unicode 
Unix
    communication-monitoring tools 
    CPU monitoring 
    disk usage  2nd 
    file descriptors, monitoring availability of 
    forking processes on 
    generating stack dumps 
    measuring network bandwidth 
    memory-mapped filesystem 
    netstart utility 
    paging, monitoring 
    priority of processes 
    process and thread-listing utiilities 
    profiling object creation 
unmarshalling objects 
unrolling loops  2nd 
unSetEntityContext( ) 
updates
    arrays of primitive types vs. object arrays 
    costs of different types 
    database
        batching in JDBC 
        eliminating unnecessary (example) 
    optimizing objects for 
URLClassLoader class  2nd 
URLs
    Java performance tuning resources 
    load balancing based on 
useBean action 
User Datagram Protocol  [See UDP]
user interface usability 
user-controlled transactions 
user-interface thread and others 
users
    expectations for performance 
    multiple, benchmarking and 
    number simultaneously using application 
    performance perception of
        latency and 
    statistics on, analyzing 
    training 
utilization, CPU
    analyzing statistics on 
    measuring