The problems I've had at CDG were in entry control. 4 or 5 jumbo jets disgorging in-bound passengers at the same time all to be routed through a single immigration officer. Sure there's a ton of booths, but only one officer. I think they've both been mid-afternoon Saturday arrivals.
One time I think I timed it at around 2 and a half hours to get processed. No particular questions, just the usual look at the passport, look at you, stamp off you go. But there were probably a thousand people passing through the control point.
The funny thing is, in CDG, what was bad was the immigration exit control. Entry was a breeze and I was asked exactly zero questions even having presented a non-EU passport.