Various improvements suggested by Google

[pcav]

https://developers.google.com/speed/docs/insights/SizeTapTargetsAppropriately
https://developers.google.com/speed/docs/insights/LeverageBrowserCaching
https://developers.google.com/speed/docs/insights/OptimizeImages
https://developers.google.com/speed/docs/insights/BlockingJS

Unsure whether all apply however.

[tomchadwin]

For the last one, try moving all the script tags to just before the closing body tag. Not sure I can help with the others without more specific info relating to those issues on your site.

[pcav]

Not sure this is possible: it's Sphinx that places it. Perhaps worth opening an issue on https://github.com/sphinx-doc/sphinx/issues

[pcav]

Full test here: https://testmysite.thinkwithgoogle.com/