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Message: <blockquote data-quote="Lifeisabeach" data-source="post: 1872032" data-attributes="member: 38864">I have a 2019 iMac myself and I'm not seeing any performance issues with Big Sur vs Catalina. I did hold off upgrading until 11.1 was released, so I would certainly give updating to that a whirl as ferrarr suggested.As for TextEdit, the current version is a slightly newer build, so maybe that will address your problem also. I'm not quite sure how to test it myself without using the same types of files you are working with. Try the update, then let us know how it works out. After updating, use Onyx' full suite of maintenance tools to make sure you don't have any caching issues that are behind this. Bear in mind that when Onyx wipes out those caches, your first restart will be a bit sluggish as the system rebuilds them.</blockquote>