Animation/Pan Responder laggy in my expo

I made a simple Snack to see if it anybody else experiences noticable/semi-frequent lag in this fairly basic pan/animation code (any suggested code improvements are welcome too).

When I open this Snack in my expo I often experience a lag to the drag, sometimes it doesn’t move for a few seconds. Then it works fine for a while. I switch to another App (with expo in the background) then I switch back, and then (often) experience the same lag.

I’m not sure if the problem is with my phone / my expo / the code, or something else…

iPhone 6+ with expo 1.18.0.****