It's been a couple of years since I have used enroute but I think the it a tab when posting out that can cause this. It has to to with inches per minute or inches per seconds. Something like that. if you look at the code you can tell if the feed rate looks like F10.0 and is in IMP then it will be slow. If it's in IPS mode it will function normally. We had a Multicam router so it might be totally different.
Hope that helps.