How do I determine my app's capacity?

Run progressively increasing load tests. When response times exceed your SLA or error rates spike above 1-5%, you've found your capacity limit. This is the point where you need to scale.

How often should I do capacity planning?

Before major launches, after significant architecture changes, and quarterly as a baseline check. Automated load tests in CI/CD can catch regressions early.

loadtest.dev

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Know your limits before your users find them

Capacity Planning

Use systematic load testing to determine your infrastructure's capacity. Find out exactly how many concurrent users your app can handle, at what point performance degrades, and when you need to scale.

Progressive load testing methodology

Identify exact breaking points

Cost-per-user infrastructure analysis

Auto-scaling validation

Baseline establishment for monitoring

Data-driven scaling decisions

capacity-test.js

import http from 'k6/http';
import { check, sleep } from 'k6';

// Gradually increase load to find the breaking point
export const options = {
  stages: [
    { duration: '2m', target: 50 },
    { duration: '2m', target: 100 },
    { duration: '2m', target: 150 },
    { duration: '2m', target: 200 },  // Free tier max
  ],
  thresholds: {
    http_req_duration: ['p(95)<1000'],
    http_req_failed: ['rate<0.05'],
  },
};

export default function () {
  http.get('https://myapp.com');
  sleep(1);
}

Frequently asked questions

Related guides

Stress Test Your Website

Step the request rate up until a threshold breaks, and find the last rate your site handled.

Soak Testing

Run extended soak tests to find memory leaks, connection pool exhaustion, and performance degradation over time.

Spike Testing

Test how your application handles sudden traffic spikes. Simulate flash sales, viral moments, and DDoS-like scenarios safely.

Run this as a plan

Put the scenario in your app's Config/load-plan.json and run it from the narduk-app CLI.

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