definitely an improvement with the latest HOTFIX - well done team 
More of that please
Thought - seeing as though the only thing that is still bad and i dont think its all corona related - is the material editor. It would be great if corona had its very own material editor, outside of autodesk with the hope that the UI is completely in the hands of the Corona team. the material editor in Max has forever been laggy. I did write a post on this with a supporting video.
https://forum.corona-renderer.com/ material editor SLOW - i think its a CORONA issue?
have a great weekend all.