What are the website performance metrics?

Nowadays eCommerce websites and online publishers are extremely competitive space. Online shoppers and Content consumers looking for the best user experience while selecting a website for their needs. So it's really important to optimize our website with good UX and performance. There are lots of metrics to monitor our website performance. Like,

• Page load time
• Bounce rate
• Peak response time
• error rate

Do you guys know any other important metrics to monitor our website performance?