I feel with you, as I'm in the same boat. Word and outlook are fine, teams is, well it works but I don't quite understand how displaying a couple of lines of text can possibly be so slow, but some of the other software we use has made me want to quit my job.

Our file management software works, and has all the features we need, but goddamn it's so slow and it's made me want to punch my screen so many times. And it's full of bizzare choices.

Pressing enter when editing filenames doesn't accept the filename, it just adds a new line as the filename. Copying text from the file preview works, but somehow it switches every "g" to a "q" (it seems to run OCR on a text document and then just display that???) etc