Hi Skywolf95, there are some settings you can adjust to help with large files.

Before loading your heavy file, go to Options > View > Meshing parameters and set "Mesh angle" to a rougher angle like 25 or 35 degrees and uncheck "Add detail to inflections".

That will make for a rougher display mesh for drawing shaded surfaces, the default is fairly dense.

Also maybe uncheck "Display hidden lines".

- Michael