You can test your site speed using pagespeed Google Pagespeed Insight

1. Choose better hosting for your site
   
2. Use the light weight WordPress theme
   • WordPress theme with lots of widgets dynamic element , slider
   • You can remove all extra things from theme
     
3. You can reduce the images size
   • There are many options available to reduce the images size
   • Here we are talking about easy ways
   • Let’s talk about some plugins
   • WP Smush
   • EWWW Image Optimizer
     
4. Minify Js and CSS
   • you can manually minify js and css using online tools
     
5. Install caching plugin and make some setting
   • There are many caching plugin in wordpress
   • Here we are talking about w3 total cache
   • W3 Total Cache you can download plugin from this URL and install in your site
     
6. Enable GZIP Compression
   • You can add below code in your .htacess file
     <ifModule mod_gzip.c>
mod_gzip_on Yes
mod_gzip_dechunk Yes
mod_gzip_item_include file .(html?|txt|css|js|php|pl)$
mod_gzip_item_include handler ^cgi-script$
mod_gzip_item_include mime ^text/.*
mod_gzip_item_include mime ^application/x-javascript.*
mod_gzip_item_exclude mime ^image/.*
mod_gzip_item_exclude rspheader ^Content-Encoding:.*gzip.*
</ifModule>
     
7. Deactivate uninstall plugins in your site