One of the applications hosted on our platform started returning a 502 Bad Gateway out of nowhere. A 502 Bad Gateway response code usually means that either the PHP-FPM pool has crashed and cannot be connected to, or all the workers are occupied by long-running code, deadlocks, I/O blocks. Within minutes our team was investigating…
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WordPress Performance Benchmark – A Year Later
We launched our WordPress performance and security benchmark tool a little over a year ago. So far we’ve had almost 3500 benchmark runs across 2000 unique domains, so we decided to do a quick analysis of average and aggregate benchmark metrics.
Profiling WordPress Performance
Performance is key for high-traffic WordPress sites, and there are two main ingredients for great WordPress performance – caching and profiling. In this short tutorial we’ll focus on profiling, how it complements caching, and why all of it really matters.
Moving A Single Site Out Of A WordPress Multisite Installation
We have written how to move a single WordPress site into a Multisite installation quite a while ago. It’s time to find out how to do the opposite — migrate a site from inside a Multisite installation, into a standalone single-site WordPress install. Let’s get splittin’ ;)
PHPMailer Vulnerability and WordPress
There’s lots of panic around the holidays regarding CVE-2016-10033 – a critical vulnerability in the PHPMailer library, which allows an attacker to inject custom command-line commands and have the webserver execute them (RCE – remote code execution). WordPress uses PHPMailer, yet there hasn’t been an update yet (see trac ticket #37210), the ticket hasn’t been marked as critical…
WordPress 4.7
WordPress 4.7 has been released a few moments ago, and includes a brand new default theme, starter content support, video headers, custom CSS, menu management improvements, content endpoints for the REST API, and much more.
Case Study: WordPress Popular Posts Performance
Our performance audit team is constantly on the lookout for slow client code that is running on Pressjitsu servers. Code that can be optimized yields significant performance gains, making our clients happy with faster WordPress sites, handling more requests.
Don’t Cache WP_Query Objects
WP_Query is one of the most complex classes in the WordPress codebase. It’s extremely powerful and flexible, but that flexibility often results in slower database queries, especially when working with metadata. To speed things up, WordPress developers tend to cache the results of such queries, but there are a few pitfalls you should be aware…
WordPress 4.6.1
WordPress 4.6.1 is a security and maintenance release. It patches an XSS and path traversal vulnerabilities found in previous versions of the core software, and also fixes a few bugs found in the 4.6 release.
WordPress 4.6
WordPress 4.6 has been released a few days ago and includes better plugin and theme updates, native fonts for the admin area, visual editor improvements, better Multisite performance, resource hints and much more.