Module 3 of 3 in Networking & Concurrency in SwiftUI

Performance Optimization

Sep 21 2025, Swift 6, iOS 26, Xcode 26
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Take your app to the next level! This module will equip you with advanced techniques to optimize your network calls, threading, and memory management, resulting in a faster and efficient app. Now updated with new lessons on unit testing and UI testing. By Mina H. Gerges & Eric Jenkinson.

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EXPERIENCE
Beginner level
EST TIME TO COMPLETE
2 hrs, 5 mins
CONTENT
5 lessons
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Module outcomes

  • Understand the importance of performance optimization and its impact on user experience.
  • Identify and analyze common performance bottlenecks in networking and concurrency.
  • Implement effective techniques to optimize performance in your iOS apps.
  • Understand the importance of unit testing and UI testing.

Covered concepts

  • Network performance optimization techniques
  • Threading optimization strategies
  • Memory management
  • Unit testing
  • UI testing

Module content

1
Identifying Performance Bottlenecks Lesson (19 mins)

In this lesson, you will explore the crucial topic of performance optimization in iOS app development. You will learn about the importance of optimizing app performance and explore common bottlenecks for performance optimization. Next, you’ll establish best practices for SwiftUI view optimization like lazy loading and identification in lists.

 Start
Introduction • Start Reading · 1 min
Instruction Reading · 10 mins
Demo Video · 8 mins
Conclusion Reading · 1 min
Quiz: Identifying Performance Bottlenecks 8 questions
2
Networking Optimization & Caching Lesson (22 mins)

In this lesson, you will understand the importance of caching for efficient network communication. Then you’ll know about different types of caching. Finally, you’ll apply caching mechanisms for both the images and the URLSession.

 Start
Introduction • Start Reading · 1 min
Instruction Reading · 9 mins
Demo Video · 11 mins
Conclusion Reading · 1 min
Quiz: Optimizing Network Communication & Caching 8 questions
3
Thread Optimization & Memory Management Lesson (19 mins)

In this lesson, you will explore the crucial topics of thread optimization and memory management in iOS app development. You will learn how to leverage modern concurrency features like async and await for multiple asynchronous calls, as well as utilize powerful tools like Instruments to effectively identify memory leaks. Additionally, you will explore essential memory management best practices to prevent leaks and optimize resource utilization, ensuring your app runs smoothly and efficiently.

 Start
Introduction • Start Reading · 1 min
Instruction Reading · 9 mins
Demo Video · 7 mins
Conclusion Reading · 1 min
Quiz: Thread Optimization & Memory Management 8 questions
4
Introduction to Unit Testing Lesson (40 mins)

This lesson provides a comprehensive guide to the modern Swift Testing framework introduced at WWDC 2024, designed for developers new to unit testing. It explains why unit testing is essential for code quality and then details how to write expressive, powerful tests using the new macro-based API.

 Start
Why We Write Unit Tests • Start Reading · 5 mins
Swift Testing Reading · 6 mins
Your First Test with @Test Reading · 9 mins
Grouping Tests with @Suite Reading · 9 mins
Advanced Test Customization with Traits Reading · 4 mins
Parameterized Tests Reading · 5 mins
Conclusion Reading · 2 mins
Quiz: Unit Testing 6 questions
5
Introduction to UI Testing Lesson (25 mins)

This lesson introduces the Record → Replay → Review paradigm, a modern, three-phase approach to UI automation in Xcode designed to create robust and insightful tests

 Start
Introduction to UI Testing • Start Reading · 3 mins
Introducing the Three-Phase Paradigm Reading · 3 mins
Introducing the Sample Project Reading · 4 mins
The Record -> Replay -> Review Flow Reading · 13 mins
Conclusion Reading · 1 min
Quiz: UI Testing 6 questions