I am asking about improving the site speed .
First, I checked my site speed using pingdom .
Then i installed Autoptimize and optimized all images , but unfortunately the site speed remain the same.
It would help if you post your site to have a look.
Thera are many steps that can improve your site spped. Autoptize as far as I know dows not affect image size and from my experience affect little of the site spped bud does well on website score grade.
- Reduce by hand the size of the picture and install a plugin for compresion like wp-smash
- Check that your websites wordpress and plugins are uptodate. Remove all the plugins that you don't use.
- Confirm that your webhost is using PHP 7 as Adam shows here: https://www.youtube.com/watch?v=ql0Q2RkKTME
- Install a cache plugin.
- As Adam says (constantly and he is right) the webhosting provider is crusial for the loading speed.
Those steps are some of many that you can do.
I would advice you to backup before anything so you would be sure.
Good luck with the proccess.