Leverage browser caching

Enalbe mod_expires on server
LoadModule expires_module modules/mod_expires.so

And make following changes on htaccess file.
enable Cache-Control headers

enable Expires headers

You might also turn on the ‘KeepAlive’ connection. Read more on ‘keepalive’ https://abdussamad.com/archives/169-Apache-optimization:-KeepAlive-On-or-Off.html
Add the following code on htaccess to turn on ‘KeepAlive’, And you should know that Keepalive will improve website loading but will eat more ram.