There are lots of activity for Optimize the website, which is most important for get more business and leads.
Here are the list of activities:

1) Optimize your images
2) Optimize your HTML
3) Reduce HTTP requests
4) Use text instead of images
5) Magnify scripts and CSS
6) Use a Content Delivery Network (CDN)
7) Cache your output
Avoid bad requests
9) Enable gzip compression
10) Choose infrastructure wisely