Many more assemblies reloads since 2018

I believe it's since 2018 that I am noticing the editor is reloading assemblies and firing recompilation a lot more than before.
Is it a side effect of the migration to the new mono runtime?

When I open Unity it reload everything and it's also recompiling the source even if there was no change which wasn't the case before.
Whenever I play or pause the editor, it reload everything every time. Maybe this was the case even before, but then it got a lot slower because now it's taking 6-7 seconds on my project to start playback, and my codebase is not that big.

 

I can but I don't think I can isolate the issue and I can't send the whole project, is it ok with just the description?
Here is my project on a empty scene, play takes almost 5 seconds.
There is some talk about the slow assembly reload on the incremental compiler thread:
https://forum.unity.com/threads/unity-incremental-c-compiler.523993/page-5

I'll see if I can have similar lag on an empty project with just 3rd party assets.

 

I just tried an empty project and it play in 2 seconds, it was almost instantaneous before.

 

Recompiles triggering more often is one issue. We need a repro case for this.

Assembly reloads taking longer, is a different one. The issue you linked in the incremental compiler thread has been fixed and should be available in a Unity 2018.1 release soon. The release notes for this are:

Editor: Reduced enter play mode and recompile time by optimizing EditorCompilationInterface.GetTargetAssembly and EditorCompilationInterface.GetTargetAssembliesWithScripts. Has a high impact on projects with lots of scripts and lots of .asmdef files.
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You might also want to check in the Package Manager UI whether you have unnecessary packages included that can lead to additional recompile/enter play mode time.

 

Thanks to both. I'll wait for the new version then.
I had just made a comparison between Unity 54 which I still had laying around and 2018 with the same few third party dll and script best http, dotween, leantween, console enhanced, unity ads, unity iap and unity analytics.

Unity 5.4 did play in 1.5-1.6 seconds
Unity 2018 in 2.5 seconds

In 2018 I removed all extra packages except the one listed above.
Should I report it anyway?

 

Will it be backported to LTS? I have serious problems regarding compilation times and play entering time with a very high number of asmdef files.

 

For me opening just closed project took about 5 minutes and almost all the time in Compiling AssemblyDefiniton files.