I have had this same project since unity 5 and have kept updating unity and the project whenever something big comes out with new version. However now it seems like this is the end and I can't go higher than unity 2018.2. When I tried the 2018.3 beta I started experiencing a continuous crash during startup after the editor loads, basically it just loads the editor normally then just before it shows anything in the scene and game view window the editor just crashes. I looked at the error files and causes, googled a bit and found out it is (most likely) my scene doing it. I just manually went and reset the scene which the editor loads and voila it worked without a crash. I was first afraid it would just crash after I open the scene which caused a crash at startup but surprisingly it didn't crash and I found out that for some reason the editor crashes if it has to load that scene during startup. I thought that no worries I'll just exit the editor while in another scene, and it worked flawlessly. Now that the 2018.3 was fully released I tried opening that same project with it but this time no matter what I do it crashes not even changing the scene helps, as it does load the editor but if I try to load that one certain scene the editor just crashes. I'm so done with this crashing so please if you have any idea what could be causing this please help! As otherwise I may move to another project and just abandon this or change engine (Which I wouldn't like to do btw) Edit: Issue has been researched more. It is the scene it is too heavy for the editor to load I have to first load a scene with half of the assets of the main scene in order to be able to load the main scene without a crash, still would appreciate help if this can be solved some how.