Dev kit doesn't start test map

Since the last dev-kit update I can’t seem to start the test map anymore and editing blueprints takes ages to load.
Before the update it took less then 30 seconds for me to open a print and under 2 min to start the test map.

Reinstalled and everything.
Anyone have an idea on what could be wrong?

Might be the thousands of shaders that need to compile on a new devkit release. It should have a pop up box somewhere showing how many to go.

Do not save any changes made to the default test map, or your dev kit may fail to launch correctly. Always make any necessary changes on a copy of the default test map, which you can save in your mod folder.
If you use Epic launcher’s “Verify” option, it will revert your ADK installation to it’s original state.