The document outlines best practices for load impact performance testing for developers, emphasizing the importance of setting performance goals for API endpoints and conducting various types of load tests. It covers considerations for test scripting, interpreting results, and identifying performance trends related to code changes and infrastructure issues. The document also suggests the need for continuous testing in the integration pipeline and scalability through version control and collaboration.

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Performance Testing
For Developers

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Mark Meier
Client Success, Team Lead
Load Impact
Agenda
● Setting the Stage
● Q&A with Mark & Ragnar
● Audience Q&A
Ragnar Lonn
Load Impact Founder

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Setting the Stage
Mobile App
● Standard REST API, running on
AWS
● Python Backend
● App is live, positive user growth
DevOps developer needs to load test
● Automated tests on staging
system
● High level performance goals

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Q: Where should we start?
Start with Requirements
● Per Endpoint Goals
● Which endpoints are important?
● How do they affect user satisfaction?
Start Small

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Q: Test script considerations?
Test Considerations
● Checks & Thresholds
● Sleep time
● Parameterization

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Q: How long should my tests run?
API Testing
Requests per Second
5+ minutes
Website / Web App Testing
Virtual Users (VUs)
2-5+ complete iterations of the user
journey for ALL Virtual Users
Ramping VUs

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Q: How do I interpret my test results?
● Exceeding defined Thresholds?
● Request rate should follow VUs
● Response time should stay stable

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Q: What are the different types of load tests?
Baseline Tests-- Establish your Threshold Levels
Load Tests
Spike Tests
Stress Tests
Endurance Tests
Threshold
Threshold

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Q: What else can performance testing tell me?
Performance Trends
● Has a code change introduced a performance
regression?
Infrastructure Issues
● Identify licensing, connection, memory, etc.
configuration issues
● Optimize your app to reduce SaaS
infrastructure costs
Performance Trend
Over Multiple Test Runs

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Q: How often should I run tests?
Continuous Integration Pipeline
● Nightly builds - run small load
tests
● Other considerations for
DevOps and QA teams

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Q: How can I ensure scalability of my testing process?
● Use your Version Control System (VCS)
● Modularization
● Collaboration

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Learn More
k6 documentation: https://k6.io (join our slack team!
https://k6.io/slack/)
GitHub repo: https://github.com/loadimpact/k6
Load Impact Docs: https://support.loadimpact.com/4.0/
Load Impact Support - support@loadimpact.com
Try out k6 & Load Impact 4.0 with a free trial

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Performance Testing for Developers
Thank you!