How to decrease the app launch time?

To decrease the app launch time, you can follow several strategies discussed in various WWDC sessions:

1. Use Instruments to Diagnose Performance Issues:

   • Utilize the Time Profiler instrument in Xcode to visualize CPU usage and measure how long different parts of your code take to run. This can help identify bottlenecks during the app launch.
   • The new flame graph feature in Instruments provides a high-level overview of trace execution, allowing you to spot issues quickly. For example, if you find that asset loading is taking a lot of time and is being done on the main thread, you can parallelize the loading using a task group and move the execution to the background. This can significantly speed up the launch time (What’s new in Xcode 16).

2. Optimize Data Loading:

   • Avoid synchronous data refreshes from the cloud at app launch. Instead, consider more efficient ways to handle data loading, such as loading data asynchronously or in the background (Xcode essentials).

3. Minimize Initial Downloads:

   • For games, ensure that the initial stages are downloaded at launch to allow players to start playing immediately. Additional game data can be downloaded in the background to provide a seamless experience (Design advanced games for Apple platforms).

4. Use On-Demand Resources and Background Assets:

   • Utilize Apple frameworks like on-demand resources and background assets to pull down additional game data after the app installs. This helps in reducing the initial load time and provides a smoother user experience (Design advanced games for Apple platforms).

5. Thread Performance Checker:

   • Xcode 16 includes a thread performance checker that can help identify main thread hangs, priority inversions, and excessive disk writes. Addressing these issues can improve app launch performance (What’s new in Xcode 16).

By following these strategies, you can effectively decrease the app launch time and provide a better user experience.