Message Throughput - Performance Issue

We have installed ejbberd-2.1.10 from the binary installer (Win7 32bit 2.93GHz Core2Duo 3GB RAM). Since our set-up needs a very high message throughput we have looked through the performance tuning reference and made changes in ejabberd.cfg and ejabberdctl.cfg files with

{shaper, normal, {maxrate, 10000000}}
ERL_MAX_PORTS=65536
ERL_PROCESSES=250000
ERL_MAX_ETS_TABLES=20000

Now when when clientA sends messages to clientB,with 10 messages each of 1500bytes

The time taken is as follows
1)With the default values -14.3 seconds
2)With my overriden values given above - 1.70283 seconds

This still doesn't meet out performance requirements. Could anyone please help me on how to push this limit further???Any help on this would be really great.

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