1.Log in to your Cpanel account.

2.Go to software section and click on Optimize the website  option.

3. Click on Compress all content and click on Update Configuration.

4.Go to Databases section and click on phpMyAdmin option.

5. Then click on the database of your website and scroll down click the check box check all and from below dropdown click on Optimize table.

6. Once followed the above steps your site will be optimized and will work with good speed.