Slip,
I've managed a stress free 17 minute turn at LDY with around 130 pax in and out; we were the only aircraft n the ramp tho!
Equally, at CIA with 150 ish I've had 1 hr + caused by poor ground handling ( there is no IATA delay code for Italy) but I've also had a 25 minute turn in Berlin with a full house each way: but hey, they are German!!
Essentially, a great deal of the ground time is down to the handling, not FR crews: the culture of the country makes a huge difference.