It's horrible.
The distance from Camping La Cascade to the start of the slope measures no more than a mere 100 meters. So, when you leave the camping your muscles won't have time to warm up before braving the steep mountain road.
After turning left it climbs right from the start with a grade of 10%. After a turn right this percentage increases.
The middle part of the climb doesn't exceed 8%, but after you have passed the church halfway, the show really begins.
12% average is no exception. The worst part is that you are able to see the finishline from below with still 6 miles to go.