I’ve started experiencing this issue in the last few weeks as well. It’s not only with editor but doing anything in studio causes it to lag for a few seconds, even something as simple as clicking something in Workspace.
I have a PC/Windows computer that does not have the same issue, but it is still annoying to have to switch between the two.
I’ve reinstalled ROBLOX, deleted all my plugins, updated my flash player and OS, everything… nothing fixes the issue.