There should be fps and ms/frame statistics texts in performance overlay but they're missing on my Moto G4 (with or without software rendering) and my Linux Android simulator.

Strangely, the text appears on iOS simulator and iOS devices.

The text is drawn in https://github.com/flutter/engine/blob/master/flow/layers/performance_overlay_layer.cc#L22 without any font config. So this might be a Skia regression.