Reply To: How to set expire Images, CSS, JS in PHP

[Chathula]

For images you can use tools like this to compress the image size.
http://pngmini.com
https://tinypng.com
http://compresspng.com

for css you can minify it .
http://cssminifier.com

for JS you can compress it too.
http://jscompress.com
http://closure-compiler.appspot.com/home

and also you can use media quries to import another css files into the site.and also for load images.always code website mobile first.it also help to improve the website speed!