It took 4 minutes for me this morning to replay a chat of maybe 200 messages, and that's with one person. I can't even imagine how bad it must be with multiple big groups. Sending takes ages, often being out of sync with the phone app, and I get notifications for messages I replied to half an hour ago on my Desktop when unlocking my phone.
Not sure if I'd wanna stay on Signal at the moment if it stays like this, maybe Matrix is really the better choice - at least Element on the web is by far superior to signal.