Right - i figured it out.
The problem was caused by the "ETS2 [Tool] Construction Roof Grill + Led Bar" mod.
I switched to a truck that had the roof grill installed, that's why it popped out of nowhere.

Hello, My game slows down when i turn on my turn signals. The slowdowns occur "to the rhythm" of the turn signal sounds. It seems like it's related to the blinker sound? It only happens in first person view, in the cabin. Everything was fine until just now when i launched the game. Headlig...

u are on dum my man
u are truly off the goop on this one chief

Posting an official announcement about ST <> ProMods incompatibility and pinning it in a well-visible place (front page?) would be a good idea, don't you think?

Aaand also posting progress updates in that announcement thread. Would help with all the questions and spam.

Wh-what?

Can we get an update on the progress?

Whew. Alright, waiting for the Special Transport DLC compatibility patch. Keep us updated devs

Darkfizch wrote: ↑

24 Dec 2017 20:15

It will be required in the future anyway so it's best to buy it when you can.

I wish i could

Let me ask the real question here

Will 2.26 require the Italia DLC?

This looks like a DLC request but i don't understand why is it posted on a community-made forum about a community-made modification.