Just to see if this is a design error on the part of Epic I completely uninstalled everything, and did a fresh install of 5.4 and 5.5 then open Epic Games Launcher and opened 5.5, not a project, but just 5.5 and it compiled thousands of shaders before I even asked it to generate a new project. That means that it is a MAJOR DESIGN FLAW, worse yet it may be intentional and something they are never going to fix, so the Engine is just no good for large maps unless you are running a new rig that cost about 6k.