Performance concepts and SLOs

18 min · Module 18

Measure latency (response time), throughput (requests/sec), error rate, and saturation. Agree SLOs (e.g., p95 create < 2s).

Lab: release 1.1.0-rc adds ~2s create delay—practice waiting vs declaring an SLO miss.

Example / notes

import time
# timing create ticket UI or API
# t0=time.perf_counter(); ...; ms=(time.perf_counter()-t0)*1000
# Compare against agreed SLO, not a guess

Practice in Lab: /lab/app/tickets/new/

Designing a minimal performance check →

Modules in this track

15. QA Foundations — Strategy & Planning
- Writing a test strategy
- Test planning and estimation
16. Test Design Techniques
17. API & Contract Testing
- HTTP API testing fundamentals
- Contract and schema testing
18. Performance Testing Basics
- Performance concepts and SLOs
- Designing a minimal performance check
19. Security Testing Basics
- Auth, sessions, and authorization
- OWASP-minded checks for web apps
20. Accessibility Testing
- Accessible by design checks
- Automated a11y smoke
21. Mobile Testing
- Mobile web quality risks
- Native apps and device farms (overview)
22. CI/CD, Quality Gates & Environments
- Pipelines and quality gates
- Environments and progressive delivery
23. Test Data, Environments & Observability
- Test data management
- Observability for QA
24. Soft Skills — Stakeholders, Mentoring, Metrics
- Stakeholder communication
- Mentoring and quality metrics/OKRs
25. Career & Process — Agile, Compliance, Senior Bar