As a user pointed out, you can try this: Settings → Optimize battery usage → Click on "Apps not optimized " and select "All" → Search "com.samsung.android.biometrics.app.setting" → disable. It significantly improved speed and accuracy of my fingerpri...
Wow. This was revolutionary. Thanks bro. Significant improvement.it's still very laggy sometimes, but at least i don't want to bang my head on the wall every time i try to unlock my phone