Slow query and plugin GUI performance since update to java 7 64bit/Increased Heap size

Hi,

Wondering if anyone can offer any advise on this as I have looked around
and cant really seem to find an answer on this.

Since updating to Java 7 64 bit from Java7 32 bit and increasing the
MAX_HEAP_SIZE I am seeing slower query performance when trying to query
data via the Plugin GUI's such as Elasticsearch HQ.

On the stats page for the GUI, the only part which was RED is the index
refresh. This is now currently Yellow after lowering the MAX_HEAP_SIZE to
4gb from originally 50% of the total which was 32. (Set to 16GB originally
when updating to Java 7 64)

Any ideas on why after updating to Java7 64 and upping the HEAP that this
would affect performance so dramatically as it was faster when using java
32 with a lower heap.

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Forgot to mention were currently running elasticsearch
version elasticsearch-1.3.2-1

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