System Requirements
OpenLiteSpeed is efficient, but it still depends on the workload you plan to serve.
| Resource | Practical starting point |
|---|---|
| CPU | 1 to 2 vCPU |
| RAM | 1 GB minimum, 2 GB or more for PHP sites |
| Disk | Fast storage for logs, cache, and web content |
| OS | Modern 64-bit Linux |
Read the table correctly
These are baseline numbers, not universal production answers. A mostly static site and a busy WordPress site have very different requirements, even if they use the same web server.
Minimum versus comfortable
There is a difference between "the server starts" and "the server runs comfortably in production." OpenLiteSpeed itself can be efficient on a small machine, but real applications often make the practical requirement much higher.
What increases resource demand fastest
- many PHP workers
- large plugin-based CMS workloads
- heavy logging
- cache growth
- reverse proxying to several backends
- database activity on the same host
CPU planning
CPU needs rise when you introduce:
- many concurrent TLS handshakes
- heavy PHP execution
- compression overhead
- traffic spikes with poor cache hit rate
Capacity planning rule of thumb
When sizing a server, estimate the combined cost of the whole stack:
- OpenLiteSpeed itself
- PHP workers
- database service
- cache service like Redis
- operating system overhead
Memory planning
RAM is often the first real limit in PHP-oriented stacks. Even if OpenLiteSpeed itself is modest, PHP workers, database buffers, cache services, and the operating system all compete for memory.
If the server starts swapping, performance usually degrades sharply.
Important note
Dynamic PHP sites and CMS stacks usually need more RAM because PHP workers and database services consume memory quickly.
Starter profiles
| Profile | Practical shape |
|---|---|
| Lab or test VM | 1 vCPU, 1 GB RAM |
| Small production PHP site | 2 vCPU, 2 to 4 GB RAM |
| Busy CMS stack | 2 to 4+ vCPU, 4+ GB RAM plus external cache or DB planning |
Disk and filesystem thinking
Do not think only about application files. Disk planning should include:
- logs
- cache data
- backups
- certificate material
- package growth over time
Fast storage matters most when PHP, cache, and database activity all live on the same host.
Network planning
If you expect high traffic, CDN fronting, or HTTP/3 usage, verify that the surrounding network path is as ready as the server itself. Firewall rules, public bandwidth, and latency all affect the real result.
Key takeaway
Size the server from the workload, not from the web server alone.