Question 1

How to set up slowlog to profile only specific methods in React Native?

Accepted Answer

Use regular expression patterns in the slowlog call, such as slowlog(this, /render.*/) to profile methods starting with 'render'. The README shows how regex matching works for method filtering.

Question 2

React Native slowlog vs React DevTools: which is better for performance debugging?

Accepted Answer

Slowlog is a lightweight timer for quick, method-level insights with minimal overhead, while React DevTools offers comprehensive profiling including component trees and state changes. Use slowlog as a first check and DevTools for deeper analysis.

Question 3

Can I use slowlog in production to monitor performance?

Accepted Answer

No, slowlog only runs in development mode using the __DEV__ flag, as stated in the README. For production profiling, you'll need other tools like native system traces or custom performance monitoring solutions.

Question 4

How to exclude the constructor method from slowlog profiling?

Accepted Answer

In the options, set excludes to {constructor:true}. The README notes that if you modify the excludes list, you should always include constructor to avoid issues with the profiling setup.

Question 5

What's a good threshold value for slowlog in React Native apps?

Accepted Answer

The default threshold is 16ms, targeting 60fps performance. Adjust it based on your app's needs—set it higher to reduce warning frequency or lower for stricter profiling of slower operations.

Question 6

Does slowlog work with React Native functional components?

Accepted Answer

The README examples use class components, and since slowlog relies on method timing, it might not directly support functional components or hooks without modifications, such as wrapping hook calls in profiled functions.

react-native-slowlog

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