Hi John, another user reported that the latest version that was recently released should fix this now (20.2), thought I would reply to you so you can give it a try.  If not, I'd still recommend giving the above steps a try (reducing the Number of Recent Items to display from 20 to 0) as it might work for you too.  The lag hasn't returned for me since so hopefully it'll be fine going forward. Best of luck1  ... View more

Oh that's great!   I'm so glad it helped!  It seems like the latest version might also fix it so I'm sorry this solution didn't come along sooner but hopefully it's sorted for good now!   ... View more

Ah, I'm sorry to hear!  Did you try the above steps anyway?  I found out another cause of it can be that one of the thumbnails for the recent files can be corrupted even if it's a local file, which causes that same lag issue.    I hope you can find a solution soon or that Adobe is able to fix this so that you can use the latest version though!  ... View more

Hi all,  I noticed this happening when I recently updated.  I had tried removing the preferences like OP did and this didn't work.  What did work for me was going into the File Handling menu and changing the "Number of Recent Items to Display" from 20 to 0.   I'm working in a corporate environment and so most of our files are on a cloud server, and it seems that even though this wasn't an issue in the earlier versions of InDesign for me, it's become a little quirk with the latest version.  I'll post an update if anything changes for me, but thought it worth sharing incase this helps others 🙂  ... View more