@idontmccall I understand that but you said the mod pop-up comes after that. You seem to have two issues hence two questions:
- lags: possibly the mod popup
- Pop up for the packs: what's your anti virus program.
If the pop-ups don't go away, it's often an issue that the game can't properly write to the file where it's marked that you read it, possibly because of antiviurs program is blocking it.
You can also try deleting the ReticulatedSplinesView program but then you need to click through all the windows again + need to remark all build issues. Also if it's the antivirus blocking, you'd run into other issues as well so it's best to go to the source. I'm also not entirely sure if the info for those particular pop-ups are saved there or somewhere else.
EDIT: Here's some other thread with the same issue: https://answers.ea.com/t5/Game-and-Mod-CC-Issues/Unable-to-close-this-stupid-popup/m-p/12927139 and https://answers.ea.com/t5/Game-and-Mod-CC-Issues/New-patch-pop-up-won-t-close-freezes-in-main-menu/m-p/11512535 .. maybe the suggestions there help too.