Reply to Traktor setup/recording issues

Hi all

first post on here so be gentle

have recently migrated from rekordbox to Traktor, but having some issues with setting up

My Rig consists of CDJ-900, DJM-800 and a high spec laptop. Trying to record direct from Traktor, but cannot get this to work unless I use the internal options, b ut I lose a channel that way.
Have since installed third party software to record my sets, did one over the weekend but there seems to be a lot of lag/stammering coming from the laptop.

Is this due to the that that I am using the onboard sound card on the laptop or is it due to the fact that its a windows system? I know a lot of dj peeps use apple, but I didnt want to commit to buying a mac, just to dj as I have enough computer gear as it is.

If someone could point me in the right direction in regards to setup and correct gear, it will be most appreciated, beginning to pull my hair out here

thanks for listening

CHZ