gavnadafna - As far as I know, there is a special mod to make vanilla Minecraft run smoother. Maybe try to install something from this category.

lonarcvarden - I don't think this is necessary. It will only add to the hassle of setting it up. There is a better way to play comfortably. And you don't need to buy and download Minecraft or servers for Minecraft. Sign up at https://minecraftforfreex.com, and you can play Minecraft remotely using the site's servers. The site has many settings that will allow any player to play comfortably. I like to play on this site in multiplayer mode. You can meet new and interesting people in this mode, which makes the game safer. I think it will be useful for you.