Why is my editor lagging?

I have just installed Unreal Engine 4.19 and i have been experiencing severe performance issues. I have tested this on two of my projects, one that was running fine in 4.18 and another that i created in 4.19. My issue is that the editor is regularly dropping beneath 20 fps, i have tried to clone the projects, that did not work, but, what did work was packaging my project, in doing so i got a solid 60fps at all times.
Any suggestions on what i can do to resolve this?

Hello,

We’ve recently made a switch to a new bug reporting method using a more structured form. Please visit the link below for more details and report the issue using the new Bug Submission Form. Feel free to continue to use this thread for community discussion around the issue.

https://forums.unrealengine.com/unreal-engine/announcements-and-releases/1410408-unreal-engine-bug-submission-form

Thanks