Resizing sprite?

Hi everybody, I’m really new to Unity and I’m making a 2D infinite scroller game.
I imported a sprite to the editor and it is bigger than I’d like it to be so I simply scaled it down, but I read that using scaling will impact performance.
Considering that I don’t need the sprite to change dimensions during the game, will the scaling I applied slow down the game? Is there a way to actually resize (not scale) a sprite in Unity or should I use an external software before importing?

Set the appropriate pixels-to-units ratio in the texture importer: Unity - Manual: Texture Import Settings