Connecting Nodes in Blueprint Causes Lag

My densest blueprints are my third person character and level blueprint by far. The two blueprints each have about 250 variables and 4,000 nodes. All other blueprints have about 5-25 variables and maybe 25-100 nodes. There’s probably a few hundred blueprints total. The lag is not only happening in these two densest blueprints though. It happens in all blueprints in the entire project. Even if the blueprint is completely new and empty. New projects don’t have this issue.

The lag happens when connecting nodes, adding nodes, adding variables, and right clicking to search for nodes. What is the computer and program doing when doing this? There’s no lag when doing anything else. I can move the nodes and the entire blueprint quickly. The blueprints compile and save quicker than connecting nodes, adding nodes, adding variables, and right clicking to search for nodes. The game and everything else seems to run perfectly.