PM misbehaving on iPad

Rocket J Squirrel

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TFP Guide
Jun 7, 2018
2,306
Alamo, CA
Pool Size
35800
Surface
Plaster
Chlorine
Liquid Chlorine
PoolMath 509 (509007) works perfectly on my iPhone. Not so much on my iPad Air 2 running iPadOS 15.8.2.

When I start up PM on my iPad, it is unresponsive for a period of time up to a minute. It doesn't react to any taps on any buttons. Then it starts responding. This happens every time. It may continue to respond for the remainder of the session, but sometimes it stops responding again for a while.

Is this a known issue?