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I spent a lot of time optimising my route.
I cut out 1500m going north of Belgrade where it was pan flat and fast, saved lots in Switzerland, and did loads of iterations in France, gradually getting it down by over a thousand from my first attempt.
All to no avail though as I couldn't ride it. Ironically, my flat route through Serbia meant I was on the aerobars virtually all the time, which I've never done for so long before, and that did my neck in. If I'd taken your route, I might have been OK!
Right. So, similar distance but you had 5000m less climbing. Where was the reduced climbing though? I did Italy which was (just checked again) almost 2000m extra climbing (Mont Cenis) to lose 66k compared to my Swiss option.
There were a couple of road closures which would've added to my climb too.
Remember I spent fuck all time optimising my route. I can't sit in front of a PC all day and then again all night staring at maps.
In hingsight I should've gone with the flatter options but I'd basically committed to Italy in my head before the start.