What are way to solve problems which google PageSpeed Insights found ?

[vishalahmad]

What are way to solve problems which google PageSpeed Insights found ?

[Sonika11Mehra]

Install W3 total cache. Turn on page and browser caching. Bonus: sign up for and add MaxCDN to W3 total cache.
For the scaled images issue, the solution depends on what is scaling the images in the browser: your theme, your post content, or a plugin.