Long delay during editor startup from addressables

We're experiencing a long delay when booting the editor up with our project. It seems that doing anything in the editor (clicking on a standard Light for example) triggers addressables to initialize itself and load all assets into memory. This causes a 30-45 second delay in our project while everything is parsed. Once that lag has passed things are back to working normally, but it's getting worse as we add more things to the system. Our build server also seems to struggle much more as it's a lower powered machine that must boot Unity from scratch every time.

Tried with all 3 "Play Mode Scripts" and "Show Sprite and Subobject Addresses" enabled/disabled.

Addressables 1.16.6
Unity 2019.4.12f1

This is the call stack we get with deep profiling on when selecting a directional light after a fresh Unity boot.



Case Number 1285560

 

We've been using addressables for many versions now without this issue. We believe it was just introduced in the 1.16x version related to this:

 

From looking at the callstack I don't think the problem is related to the .Keys property - that only happens in play mode and only if that property is accessed by user code - we don't use it internally. There definitely seems to be an issue with a lot of textures getting loaded when the addressables settings object is loaded though - perhaps a direct reference to all of the assets has been added somewhere. If you are able to provide a repro project it would greatly help in tracking this down.