SmartThings, iPhone, and Samsung TV Remote in App Question!

The wife has an iPhone XR Max, and I have a Pixel 3 (android). When using the remote pad in the ST app, my mouse pointer on the tv flies at top speed, as it should. However, her mouse pointer on the iPhone looks like a HUGE buffer-type slowdown, and barely moves at all. Anyone else notice this, and have any tips/tricks/suggestions on how to get her on-screen pointer to move quicker?