There might be a driver issue or maybe you have stabilization set too high? Mine has no lag at all, only if stabilization is too high.
I'm honestly surprised about the prior complaints on the cord. I have never had an issue with my cord. The only issues I've had have been driver-related issues where I sometimes have to turn it on/off to get it to work and reload my settings.
It will also sometimes lag on the first stroke after I save in CSP. Weird, but now I've gotten used to just doing a random stroke after I save to get rid of it.