Keep in mind that by having 1 socket and 4 cores, the VM may be waiting for CPU time for one of the two sockets to have 4 cores available. You can see if this is happening by looking at the performance tab... click advanced, click chart options, Under CPU, change the time counter to 1 day, under Counters, deselect Usage in MHz and select READY. The higher the ready value, the more time spent waiting.
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