Didn't work on my website

I tried this plugin to help speed up my site and fix the ‘render blocking scripts’ issues. According to pagespeed it did neither. I usually try the support area first before leaving a bad review but, when I went there I did not see the plugin author reply to any of the support threads; nor do I see the plugin author replying to any of the review posts here. Which tells me the plugin author isn’t going to give me or anyone else any help.