Converter5.X is slower than Converter4.X ?

Hi folks.

Im on a P2V project that using VMware Converter Standalone 5.X.

Last year, we were P2V a lot of host using VM Converter Standalone 4.X.

Following lates is the average convertion transfer late P2V on same OS and enviorment.

WindowsServer2003 SP2

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Converter 4.X (to ESX4)

9.0MB /sec

Converter 5.X (to ESXi5)

2.0MB /sec

(ConverterServer was on WindowsServer2003.)

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In converter wizard, I found "Change a Volume Cluster Size" Option,

then I select "Keep source cluster size",the transfer late was better than default.

Is anyone faced on same problem?

Regards,