TCP Fast Open (TFO) is one of the simplest latency optimizations you can enable on a VPS. A single kernel parameter and an Nginx directive can eliminate one full round…

PostgreSQL creates one OS process per connection, and each idle connection can consume 5–10 MB of RAM. On a small VPS with 2–4 GB of memory, an application that opens…

Every PHP request compiles the requested script from source unless the compiled bytecode is already cached in memory. A typical WordPress installation with a dozen plugins contains 500–1000 PHP files,…

If your VPS transfers large files slowly, or throughput collapses whenever the network drops a packet, the default TCP congestion control algorithm is a likely culprit. Most Linux distributions still…

vm.swappiness is a single kernel parameter that many VPS guides tell you to change — usually to 10 — without explaining what it actually does or why the default of…

Deploying a new version of your application should not mean telling users “be right back”. On a single VPS you cannot spin up a second datacenter, but you can still…

Your VPS plan says 1 Gbps, but iperf3 reports 180 Mbps. TCP retransmits climb under load, large downloads stall, and dmesg shows dropped frames on the virtual NIC. Before you…

If you have ever watched top show 30% of your CPU as %st while your site crawls, you have met CPU steal. Steal is the time your virtual machine wanted…

CPU steal is the percentage of time your virtual machine wanted to run but the hypervisor gave the physical CPU core to another tenant. On shared VPS infrastructure it is…

Swap is the most misunderstood resource on a small VPS. Configured correctly, it is a safety net that prevents the OOM killer from terminating your database during a traffic spike….