Hello @AiTE,
first of all, sorry that you got problems like that in ETS. Here are maybe some solutions for your problem:
Disabling Season Effects and Winter Mod could help, to gain some FPS.
Disabling Cabin Accessories and Flags may also help for low end PCs ( or like in your case, laptops ). Using the 2 outside flags on your vehicle can also drop you up to 30 frames . Using cabin accessories, could also cost FPS.
IF NOT - Installing the game into a SSD helps with game loading and auto-save freeze.
Always install the latest GPU drivers. Before you install the new drivers remove the old ones with Display Driver Unistaller (DDU). You should download the drivers from the manufacturer!
Changing your save format for the purposes of save editing will cause auto-save lag issues on large profiles and slower systems. To remedy this, changing the `g_save_format` value to the default of 0 will drastically reduce your profile's auto-save time. Though with the default save format, you cannot make modifications to your save file, such as adding customs jobs using Virtual Speditor.
Always but always make sure you run the game on DirectX and not OpenCL. Running the game on OpenCL will cut your FPS to half or even cause you game crash. If you are not sure if you run MP in DirectX run the game once in SP by Choosing "Launch ETS2 DirectX (64-bit)".
Hopefully, there is something for your solution.
Kind regards
Blacko.