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To identify the causes of low performance in iOS applications, the following methods and tools are commonly used:

• Profiling with Instruments — allows analyzing CPU, memory, response time, memory leaks, and others.
• Time Profiler — helps identify bottlenecks in the code that take a lot of time.
• Allocations and Leaks — for finding memory leaks and excessive consumption.
• Network Instruments — analysis of network requests and their execution times.
• FPS and GPU metrics — for assessing graphics performance and interface smoothness.

In addition to tools, it is important to:

• analyze algorithms and data structures.
• optimize heavy operations, for example, by performing tasks asynchronously.
• use caching and lazy loading.

Example: if the app slows down when loading a list, Instruments can help determine what exactly takes a lot of time — data loading, cell rendering, or something else.