Hi there,
Sorry to hear that Photoshop is freezing on your iPad. We're here to help.
Which version of Photoshop are you using on your iPad? What is the iPad OS version? Since when do you see this lag after any specific update? Have you signed out of your creative cloud account, shut down and restarted your iPad, then logged in again? How much free space do you have in your Creative Cloud account?
We're here to help troubleshoot; we needed a few more details.
Thanks.
Ranjisha