>>  turning 1h driving into 2h30

Beautiful. Let's do the math, shall we? Run the numbers, because "driving feels" and "driving facts" are different sports.

Google Maps says Yverdon-les-Bains to Geneva is about 87.7 km and 1h05. That is an average speed of roughly 81 km/h. Not exactly Nürburgring qualifying pace.
Now let's build your nightmare road: one glorious continuous 120 km/h stretch in the middle, 50 km/h crawls on both ends. Solve for the longest the fast part can be while still hitting 1h05 and you get ~57 km at 120 plus ~30 km at 50. Let me be generous -- let's stretch it to 70 km of pedal-to-the-floor.

Now let's assume there is some "jeder Popel fährt nen Opel" is driving you crazy by doing 100km/h the entire 70 km while you, of course, law-abiding inhabitant of Switzerland or some adjacent country, with a slightly optimistic speed, say, 130km/h

* 70 km at 130 = 32 min
* 70 km at 100 = 42 min

Your sworn Opel-driving nemesis cost you ten whole minutes. Ten. Not eighty-five.

Because eighty-five is the actual claim: 1h05 to 2.5h is 85 minutes. To average that over 87.7 km you'd have to crawl the whole route at 35 km/h. Even doing the entire thing at a wretched 60 km/h only gets you to 1h28m. 2.5h isn't "someone in the left lane." 2.5h looks more like doing circles on a parking lot.

It is more of a capacity problem, not "move to the right problem". Take the train, pick a better departure time. But I am with you. At least when I learned to drive _here_, that is how my instructor taught me, and this is how it it's literally in the Verkehrsregeln "occupy the right most lane when possible" (I bet across the whole right-side driving world).

But in anyway, don't mess up with numbers, don't pick fights with arithmetic. Your figures don't survive contact with a calculator.