Blender 2.8 Image on object How can i remove it, since i'm trying transparent eyes and there is an image that's in the way. Im not sure if its an image map though.

i think that's maybe also why my blender is so slow even with so little i work with.

i just followed a tutorial and there you could choose an environment for lightning, but im not sure if that's it and if so, i did delete the environment lighting but its still on the object.

Is there a way to fix it fast?
You're in LookDev view, which applies some preset environment maps by default. To view your material as it will appear in your scene, switch to Render view, e.g. via the buttons in the 3D view header: