Faster response on rpm sensor, how?

OK i have a (noisy) cooler which has a manually adjustable speed, bit how can i make the reaction of the thing on the speed change a little faster (spin up time)
FYI at a speed of about 4300-4500 rpm it sounds just like the FS2000 B737 in-cockpit
FYI at a speed of about 4300-4500 rpm it sounds just like the FS2000 B737 in-cockpit
