VPS sizing

These estimates assume ordinary mobile browsing at approximately 5-10 Mbps average per active device. They do not model simultaneous speed tests, sustained large downloads or video streaming on every device.

VPS size	Adaptive profile	TCP flow ceiling	Fast devices	Balanced devices	Stealth devices
1 vCPU / 1 GB	Small	2,048	1-3	1-2	1-2
2 vCPU / 1 GB	Small	2,048	2-5	2-4	1-3
2 vCPU / 2 GB	Standard	4,096	3-8	2-6	2-5
4 vCPU / 4 GB	Performance	8,192	8-18	5-15	4-12
4 vCPU / 8 GB	Performance	8,192	18-45	15-40	12-30
8 vCPU / 16 GB	High capacity	16,384	50-110	40-100	30-80

Interpret the flow ceiling correctly

A TCP flow is not a user or device. One modern phone can open tens or hundreds of concurrent flows. The ceiling protects the gateway from unbounded admission; it is intentionally much higher than the recommended active-device count.

Common bottlenecks

1. Provider network throughput and fair-use policy.
2. Xray CPU during encryption and high connection churn.
3. Memory used by the web application, PostgreSQL and active flow state.
4. Disk pressure from container logs, database growth and backups.
5. Client network latency and packet loss.

The installer derives safe gateway defaults from available CPU and memory. It cannot infer provider bandwidth quality, CPU contention on a shared host or the intended workload.

Before promising capacity, run reproducible connection, throughput and restart tests on the exact VPS plan. The full benchmark methodology remains available in docs/SIZING.md.