Thank you for sharing your concern. And please follow the easy troubleshooting steps which might help to solve the issue.
The device’s ultrasonic fingerprint sensor may not recognize fingerprints from fingers that are too dry, and recognition rate may be also low. If the recognition rate is low, it is because the device tries scanning repeatedly to get the fingerprints with better quality, so the unlocking speed may become slow. However, this is not a device defect but a normal operation.
If you moisten your finger properly by using hand cream and try again, the recognition speed will be better.
Thank you for writing to Samsung. Warm regard, Samsung customer support
