Does IBM not support full speed debugging ?

We are in the process of porting some application to IBM WS 5.1 which unfortunately(?) require us to move from SUN JVM to IBM JVM.

First I thought that would be nice since IBM JVM normally have better performance and especially have much better trace and debug information.

....BUT one thing is really killing me - as soon as I enable remote debugging the IBM JVM goes in SLOW MOTION, it feels like being back in the bad old days of slow-speed debugging! Is this really true - does IBM JVM not support full speed debugging as SUN's JVM have been doing for the last couple of years ?

(I normally just google for such stuff, but IBM is also remarkable good at either being silent or hide information about JDK 1.4 on the Windows platform :)