Whenever I open a UE project for the first time it takes awhile to open, I think it’s due to loading shaders. Any additional time I open the project, the process is like 3x faster.
Other than making the default map an empty map, is there any other way to speed up the process?
The shaders need to be compiled or else the scene isn’t going to be properly rendered. You would still have that issue if you started with an empty map; it would compile the shaders when you load the non-empty map.
Once compiled they are cached and just need to be loaded which is why subsequent opening of the project is quicker.
You can buy a new powerful PC to speed up process 
On the other hand go to task manager in details you will find shader being compiled, set their priority to high it will help
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