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Practical write-ups on speed, networking, security, email and running websites.
A complete walkthrough from sign-up to a live, secure site: connecting a domain you bought somewhere else, moving your website and setting up email, step by step.
What Largest Contentful Paint measures, and the image, caching, script and font changes that move it the most on a WordPress site.
Point a cPanel subdomain through Cloudflare: which DNS records to proxy, which must stay DNS-only, the SSL mode to pick, and how to read the common errors.
Two NGINX nodes sharing one virtual IP through Keepalived's VRRP: the upstream, TLS and health-check configuration, a tracked check script, unicast peers, and how to prove failover works before you rely on it.
Why a network-wide VPN is the wrong trust boundary, and how to replace it with an identity-aware proxy for web apps and narrowly scoped WireGuard tunnels for everything else, with configs, firewall rules and key rotation.
Where tunnel overhead actually comes from: header bytes worked out from first principles, MTU and MSS arithmetic, and the TCP-over-TCP and head-of-line effects that cost far more latency than the bytes do.
How ngrok, Cloudflare Tunnel and a self-hosted SSH reverse tunnel each put a local service on a public URL, what each one trusts, and the settings that keep a webhook test from becoming an open door.
How KVM guests and cgroup v2 containers divide CPU, memory and disk between tenants, the libvirt and cgroup settings that control each, and where the security boundary actually sits.
Write, verify, load and safely roll out an XDP program in C that drops traffic from blocklisted IPv4 and IPv6 prefixes before the kernel builds a socket buffer.
Reverse DNS, SPF, DKIM, DMARC, DNSSEC, MTA-STS and clean message headers: the records and settings that remove the technical reasons receivers reject or filter your mail.
The test method behind our benchmarks: locations, page profiles and the scripts, so you can rerun every test yourself.