No issues with the August Security Patch OTA for me - But if you are noticing that your device feels slower - Boot into Recovery and Wipe Cache (I always do fwiw).
To Boot into Recovery:
Power OFF your device;
Press & Hold Power + Bixby + Volume UP - Wait until you feel the phone vibrate - Release ALL Three buttons - Wait a few seconds until you see the Recovery Menu - Use the Volume button to Scroll down to Wipe Cache - Select with the Power button - Wait a few seconds until you see the Recovery Menu defaults back to Reboot now - Select with the Power button - Done (Penguin) : )
Dude stop with your useless cache wiping. It's drastically slower and there's nothing that placebo method will enhance. You 100% have it too and there's nothing you can do about it. This goddamn update is slow as molasses. I even noticed it before reading anyone else's complains. Just go look over reddit