Smush not reflected in Google PageSpeed?

Hi there. I was wondering if I should be seeing reductions in Google's PageSpeed tests. Most pages on my sites are showing poorly in the speed tests and so have been trying out Smush but not sure I am seeing the savings that the plug-in is telling me is being achieved when I re-analyze the site.

Firstly I am just trying individual images rather than bulk. Do I need to be reimporting the image or is that automatic with that method.

Thanks in advance.

Jonathan

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