As nice as Eden might be for beginners it hurts development for advanced users. It is significantly slower than the "old" 2D editor.

One reason is that if you have lots of scripts in a mission added via CfgFunctions it recompiles every script again when going back from preview to the 3D editor!!!
This is not needeed as I just need the editor to place something once, maybe adjust it a few days later but never touch it for anything else again than starting preview.