Consider reducing default profiling duration to 30 seconds than 2 minutes

[xiaomi7732]

Reason:

• If a request is as slow as 2 minutes, there is probably no need of profiler to find out where the issue is;
• Smaller package is lightweight, easier to analysis, also less noise;
• Less network traffic, faster upload;

[xiaomi7732]

Let's give it a shoot and see.