We’ve seen a few reports of Audacity 3.x running very slowly for a few people. The Audacity developers are investigating the issue, but we are unable to reproduce the problem and so far we don’t know why it happens.
You should not have been recommended 3.0.0 because it has known bugs that are fixed in 3.0.2.
If someone recommended “an older version of Audacity”, perhaps they meant Audacity 2.4.2.
Audacity 2.4.2 is likely to solve the problem, but it cannot open projects that were created in Audacity 3.x.
I have the new audacity. Editing worked as usual-- until today. Now, I edit-- and wait. Cut. And wait. Paste and wait. WHERE DO I GET THE OLD AUDACITY THAT WORKED RIGHT???