The loading speed of the site is a very weighty signal for search engines. And for users it is a weighty factor, which is difficult not to pay attention to if there are problems with it.

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Server response time, on the other hand, depends on a lot of factors, the main ones being your sites scripts, database queries, and the remoteness of the test server.
If the JavaScript and CSS code is too long, contains a lot of unnecessary elements (spaces, comments, etc.), then the page may load with delays

Also, when using popular CMS, it is often plugins that slow down the loading, because it is already code from third-party developers.
The easiest way to identify a plugin that slows down the loading of the site is to disable each one in turn and look at the loading of the site. The debugger of any modern browser can also help you.

We always recommend analyzing from multiple test points:

Ping-Admin is a professional resource for system administrators and site owners, it performs round-the-clock monitoring of the availability and verification of work on the server of services such as:

  • HTTP, HTTPS (check the performance of the site).
  • FTP.
  • MySQL, PostgreSQL (check database operability).
  • POP3, SMTP, IMAP (functional testing of mail).
  • DNS.
  • Ping.
  • Telnet.

http://ping-admin.ru/

Pingdom Website Speed Test is one of the most well-known tools for website speed testing. The reports it provides are broken down into four sections, which include a breakdown of the loading process, performance evaluation, page analysis, and history.

https://tools.pingdom.com/

The result of the test is a set of site load speed metrics. In doing so, the tool gives a speed score on a variety of metrics.
When you click on a particular item, it expands to provide a complete list of items that contain that problem.