I added a meta cube and changed the wire size to 0.050 because it looked so smooth. but when i converted it to mesh, the rendering started to go very slowly. Is there a way i can make that same cube by using mesh? Or is there a way to make that rendering not be so slow? I want that cube in that shape as it is in meta form.
Yes! You can use normal Mesh Cube and then Add Modifier - Bevel