Profiler tools are your friends, if the performance degradation was introduced by a recent commit you should be able to track it down, they might not be open source but normally they are a part of developer toolchain and they are free.

• iOS: Performance Tools
• Android: Performance Profiling Tools
• Windows Phone: Performance Profiling on Windows Phone 8.1 with Visual Studio

If you are using backend server to collect and store information and visualise it - it might be the case when there is nothing wrong with your SDK, it is the backend server causing delays as it is overloaded. In that case check its health and schedule performance testing for it as well. Check out Open Source Load Testing Tools: Which One Should You Use? article for the most outstanding open source load testing tools.

Profiler tools are your friends, if the performance degradation was introduced by a recent commit you should be able to track it down, they might not be open source but normally they are a part of developer toolchain and they are free.

• iOS: Performance Tools
• Android: Performance Profiling Tools
• Windows Phone: Performance Profiling on Windows Phone 8.1 with Visual Studio

If you are using backend server to collect and store information and visualise it - it might be the case when there is nothing wrong with your SDK, it is the backend server causing delays as it is overloaded. In that case check its health and schedule performance testing for it as well. Check out Open Source Load Testing Tools: Which One Should You Use? article for the most outstanding open source load testing tools.