Audio Delay within the audio mixer

Has anyone had any experience with the built in audio mixer having issues of delay? I am rebuilding my boxes, I have 2 TVS and 1 1/ME - so I have been using a lip sync corrector by AV Tools, that has worked very well, - I am now trying to eliminate my audio board, and use the xlr inputs on the cameras and pass thru the audio. - well it just hit me,... - will the delay be there?

Thanks for any replies.

George