When using the Apple Pencil 1 on the iPad (6th Gen), there is a slight delay in Photoshop when compared to drawing in the Apple Notes and OneNote apps. It happens more often when the Pencil is titled. Pressure sensitivity is off for both brush settings.
Same. 1st-gen pencil, 2nd-gen 12.9" iPad Pro. No lag in other programs, including Notes, Lightroom, Procreate, and Clip Studio Pro. In Photoshop everything is slow to react to the pencil, and even something as basic as drawing a straight, plain black line (with no pressure options enabled, no smoothing, no tilt or texture, just the simplest hard round brush) is laggy.