Android : precision highp float : Not seeing any perf difference

there seems no difference on performance Between
set all highp by precision highp float
AND
only set the necessary float to highp obvisouly while others using precision mediump float ?
test on Android fragment shader.

Was this test made under conditions where you would expect to be able to detect a performance difference? Were you using hardware where there would be a performance difference?

The test condition are all same.

Ok, but that doesn’t answer either of the questions asked.

For a reasonable analysis of this behavior, you need to answer those two questions. At least to yourself,

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