Hi,
These are our core speed recommendations, doing this, particularly point 1 will help resolve those messages.
– Install WP Super Cache or BWP Minify.
– Ask your host to enable gzip compression.
– Consider serving your resources from a CDN such as MaxCDN.
– The Autoptimize plugin is great to further minify your assets: https://en-gb.wordpress.org/plugins/autoptimize/.
– Before uploading images, be sure you correctly save them for web. Consider installing and running this compression plugin to reduce image size: https://en-gb.wordpress.org/plugins/wp-smushit/.
– If you are using a cheap hosting provider your site will never be super, super fast – consider WPEngine if you want pure speed improvements.
Thanks.