Every time I try to read a document in zotero it buffers for ages - and scrolling down a document it buffers too and if I try to copy eg a title of an article it takes ages to highlight and then ages to copy. I do not use tags and I am not looking at special pdfs just normal ones and it was bad yesterday and absolutely awful today. I thought it might be my connection to the net but it isn't that. Please could someone help?