Zotero unresponsive while adding a record/downloading PDF

When adding a record which includes downloading a PDF article, Zotero becomes very sluggish to the point that I have to wait until it's finished saving the article before I can continue interacting with Zotero. Can it be made so that Zotero prioritises user interaction and downloads and saves files using the spare system resources not needed by the user? All I'm trying to do is add tags - nothing intensive.
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