don't block Process.info 0.1s

We weher blocing info retrieving 0.1s to get the CPU usage following the
psutil doc:

>> get_cpu_percent(interval=0.1)
>> Return a float representing the process CPU utilization as a percentage. When
>> interval is > 0.0 compares process times to system CPU times elapsed before
>> and after the interval (blocking). When interval is 0.0 or None compares
>> process times to system CPU times elapsed since last call, returning
>> immediately. In this case is recommended for accuracy that this function be
>> called with at least 0.1 seconds between calls.

It looks better to call it once time when starting the process then using the
interval 0.0 for subsquent calls so we don't block the call.