Performance

This module aims to preserve server resources (processors, memory, thus electricity) by not running the cron on websites that are not used.

DeferJs module is based on a tiny library deferjs.

Insta Queue provides real-time queue processing for Drupal without waiting for cron runs. It works seamlessly with both Drupal core and third-party module queues.

Adds to HTTP headers of a response the performance data of the request not only
as the actual execution time in seconds (rtime), but also the utime and
stime:

• rtime represents the total duration of the response generation process.

• utime represents the actual CPU time, exclusively spent on processing only
  the PHP code of the current request, excluding other background processes.

• stime represents the CPU time spent on kernel processes like disk read/writes
  and other IO operations.

More information: https://www.baeldung.com/linux/total-process-cpu-usage#2-the-cpu-usage

Additionally, it shows the memory usage and the disk read (inblock) and write (oublock) operations.

An example of the HTTP headers output of a response:

This module solves a real-world problem that can occur when using varnish_purger module and its submodule varnish_purge_tag

This module provides a simple health check page to use as an endpoint for site monitoring services. The health check can be configured to run under any path, such as /health-check (the default setting), or /site-up, and will respond with a JSON formatted string that can be configured to include the timestamp.