Hey, thanks for the pictures...
The West has been saved.
"I was in Salzburg on Monday, so I drove there from Vienna (where I live nearby) via the A1 highway. I would have definitely lost speed on that massive construction site, probably somewhere around Linz. The car doesn't go faster at top speed now, but the engine revs better, and in fifth gear, it's now possible to accelerate smoothly from idle to 1200 RPM without any of the previous jerking."