You have to lower the sample size of your ASIO driver (assuming you are using a decent sound card with ASIO drivers, because you should). You can do this in the Preferences menu (Options ->Preferences -> Audio). You need to reach less than 10ms latency in order to not notice anymore the delay caused by your sound card. If you lessen to much (depending on your computer and your sound card), you may experience audio cracks.
Regards,
Y.