Yes I am and it's driving me mad. I've got the Note 20 Ultra and I came from the Google Pixel 4a which was lightning fast. Its honestly the only thing that let's this phone down.
Have you added more then one finger print. Scanning the same finger twice can help with better response. I have added 2 and it opens pretty well for me.
You can add up to 4 fingerprints. Reset your fingerprints and scan both thumbs twice. See if it improves once you've scanned both twice using all 4 finger prints.
I've found the S21 Ultras reader the best I've ever used. It's both fast and accurate. Works flawlessly with all 4 fingers I've set up. I think the key is upon setting up your fingerprint to make sure you make use of the larger sensor area, try to scan all over your fingerprint.