I just updated from 4.6 to 4.7 Preview 6. It’s running fine, except just after launch. I get very bad performance (~10% of normal framerate), with small hang periods, for a few minutes.
Then I see “AssetReimport: New page: Outstanding source content changes” in the logs, with a similar popup… And performance goes back to normal.
What is happening here ?
FYI, the issue disappeared after recreating the project from scratch from source control.
I guess the fix is to remove Build, Intermediate, Saved and DerivedDataCache folders.
I am also having a similar issue after updating a project from 4.6 to 4.7.
Unfortunately this did not work for me.
Are you working with 4.7.1 ?
I believe 4.7.0, I didn’t notice there was an update (work in source). I’ll try it out now.