Google Page Speed Insight with srcset

I am using srcset and sizes for my images. However when I test my page using Google Page Speed Insight the test seems to recognise just the original image source which is my largest image rather that actual image the browser will actually use. So does google think I have not optimised my images correctly and penalise me for this or should I just ignore this and worry about the overall speed using a test like pingdom?
petewinterAsked:
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Lucas BishopMarketing TechnologistCommented:
My understanding of the PageSpeed Insight test is that it uses a version of WebKit (not Chrome) to render pages and does not support the srcset attribute yet.
petewinterAuthor Commented:
Thanks for the reply could google penalise me for this or does it just measure the page speed as a whole?
Lucas BishopMarketing TechnologistCommented:
Google plans to use pagespeed in their mobile ranking algorithm in the future (not yet). However, I would expect that they'd get this type of thing fixed, before actually using it as a ranking signal. Currently I can only assume that this has no effect on your site.

What you'd want to make sure is that the srcset directives are serving images as expected in real browsers. If it's not functioning correctly and visitors are actually downloading the high res images, over mobile connections for example, it could cause the dwell time on your page to be poor. Google will notice if people bounce back to the search page quickly and that would lead to a penalty in the current algorithm.

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petewinterAuthor Commented:
Many thanks for the advice
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