Gotta love ATC at KL. Told to maintain high speed as we descended out of FL340, but when turned over to Director at FL 130, told to slow from 310 KIAS to 190 KIAS so they could let an Air Asia flight butt in front of us. Had they kept us high speed we would have easily beaten him to the localizer. I am used to them getting priority all the time out in Sabah and Sarawak, but this was ridiculous. And PS, controllers, do you realize how hard it is to descend at 190 knots? No weather to blame this time, it was pure controller.