On many occasions, we see web site performance suffereing due to misconfiguration or oversight of system resources. Here is an example where RAM and Disk I/O severely impacted web site performance, and how we fixed them.
Secure Socket Layer (SSL) is the protocol that allows web sites to serve traffic in HTTPS. This provides end to end encryption between the two end points (the browser and the web server).
The other day, we were helping a long time client with setting up a new development server configured with Ubuntu Server LTS 16.04, which comes with PHP 7.x.
Recently, we were reviewing the performance of a large site that has a significant portion of its traffic from logged in users. The site was suffering from a high load average during peak times.