Is it possible to measure rendering time in webgl using gl.finish()?

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I am trying to measure the time it takes for an image in webgl to load.

I was thinking about using gl.finish() to get a timestamp before and after the image has loaded and subtracting the two to get an accurate measurement, however I couldn't find a good example for this kind of usage.

Is this sort of thing possible, and if so can someone provide a sample code?

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