latency problem with midi

I have a audiobox usb (presonus)
The settings seems to be ok but wheb
I play my keyboard it takes some time
Before i hear my vst instrument

Please help

In Devices, Device Setup, VST Audio System, what is your ASIO driver? What is your Input Latency? If you lower the buffer size on the Presonus you should get lower latency (if you hears pops and clicks in the audio, it is too low). What version and build of Cubase are you using?