How to get 90+ google page speed
  1. Get proper web hosting. Good Hostng, serve your pages faster.
  2. Deativate plugins you dont need. Use plugins only from reputed developers.
  3. Install WP HTML Compression plugin, to compress your site html.
  4. Install W3 Total Cache plugin, and enable browser cache.
  5. Install WP File Cache plugin, to reduce query.
Optional Optimization:
  1. Enable minify, and other option in W3 total cache.
  2. Use CDN.