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Pingdom is a website performance monitoring software.
Learn to use CDN, you can use cdn from cpanel without needing any cdn provider. The logic here is that a web browser cannot do more than 5 queries at a time. The reason for this is not to tire the server. If we set up subdomains, and the files of these subdomains are the same as the files of our site, "I am giving an example, the subdomain folder settings should be public_html instead cdn or etc. Add cdn, cdn1...
Optimise your website and get more traffic from Google.
Https://ahrefs.com/webmaster-tools Run a technical audit of your site.