Can't really tell you how your phone will act on 17.4.1. Everyone's phone is setup differently so while your phone might feel laggy, another person's 13 Pro might feel great.. If you're on 17.4.1 already you should wait till 17.5 is released and possibly it will perform better.. If not, you might want to restore the phone using iTunes/Finder on a Mac or PC and setup as a new device without using a backup.. If it fixes the issue you can restore it again using your backup and see if the problem comes back