Start activity from service takes too long

Question

I have a Service that when one function gives to me true it will start a new Activity but it takes like 5 seconds...

I've read about this issue, and I've found on StackOverflow this example to "avoid" this bug..

Intent intent = new Intent(this, MainActivity.class);
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, intent, 0);
try {
   pendingIntent.send();
} catch (PendingIntent.CanceledException e) {
   e.printStackTrace();
}

but sadly it doesn't start the Activity faster, I don't need to be inmmediate (better if it's possible), but I don't want to wait +5 seconds to launch the new Activity, do you knwo any trick to avoid this?

I'm using PendingIntent because I've found that guy that said that it should solve this issue : Starting an activity from a service after HOME button pressed without the 5 seconds delay

Note

If I press back button it launch it autommatically, 0 delay, but I'm looking pressing the home button.