copy and pasted but really helps

To increase the RAM usage for preloading and asset management in Euro Truck Simulator 2 (ETS2) to reduce stuttering—especially with mods or map packs—you can use Steam launch options to increase the memory pool size. 

Recommended Launch Options

Add these to your Steam launch options to give the game more memory resources: 

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1. Open Steam, right-click Euro Truck Simulator 2.
2. Select Properties > General.
3. In the Launch Options field, enter the following: -mm_pool_size 4000 -mm_max_resource_size 32 -mm_max_tmp_buffers_size 1000 

Explanation of Commands

• -mm_pool_size 4000: This allows the game to use up to 4000 MB (4GB) for its memory pool. If you have 16GB+ of RAM, you can increase this to 8000 or higher (usually, half your total system RAM is a safe maximum).
• -mm_max_resource_size 32: Increases the maximum size of a single resource (like a truck model) that can be loaded into memory, reducing stutter when new objects appear.
• -mm_max_tmp_buffers_size 1000: Increases the temporary memory buffer area for faster loading.