Xcode Instruments: Trace a Slow Screen
A screen stutters, but the code path responsible is unclear. This guide gives you a small, testable way to approach the issue before changing a live system.
A practical workflow
- Record the interaction with an appropriate Instruments template such as Time Profiler.
- Find work on the main thread, make one change and compare a second trace.
What to check
Simulator timing is useful for diagnosis but device measurements matter for release decisions. Compare the result with the original problem and record what changed. If a measurement or test does not support the change, revisit the assumption rather than adding more complexity.
Keep the experiment small enough to reverse. Document the starting state, the change and the result so another person can repeat the process. Product menus and versions can change, so check the current documentation for your environment.
Official reference: Read the documentation.