Originally Posted by
Seattle Forrest
What phone are you running this one, and what version of your operating system?
(I won't be able to help find the answer, but that's probably crucial info to anybody who can. The app asks your phone for its current location, and uses the location changes over time to determine your speed.)
I'm an IT professional for many years, and how silly I feel for not supplying this information. It's an iPhone 6S, purchased earlier this year. It has plenty of free memory, and I don't believe the CPU is overloaded. Right now, it's running iOS 10, but it was exhibiting the problem with iOS 9.x.