Reply to Numark Omnicontrol - Higher latency in Windows 7 64bit?

hi guys,

I have been using a numark omnicontrol for 12 months now and previously was on Windows 7 ultimate 32bit and had a latency of around 10.5ms . I recently upgraded to windows 7 ultimate 64 bit ( and i have the 64bit driver for omnicontrol from the numark website) and now at the same sample rate I get a latency of around 36ms!

is this a known problem on 64 bit systems? I want to roll back to 32 bit but only if there is no work around in 64bit system.