why has my standalone zotero become too glitchy to use?
I have a late-2011 MacBook Pro with a fairly full 1T hard drive 16 GB RAM running OS 10.12.6; I'm using Firefox 61.0.1 and Zotero 5.0.54. I have a large number of Zotero records in 3 collections. Half the time I launch the application it hangs on Loading Items and never does load them. Other times, when I do get records in one collection, I can't change to another collection and have the items load. I have to close the application and relaunch it, with loading taking 5 minutes if it happens at all. Yes other applications aren't running as fast as they used to--I'm keeping this last of the 17 inch MacBook Pros because I am usually away from my office--but they all still work, except Zotero. I don't know what to do.