What is the best crossfade time in second to set for a radio station without using too much CPU;one that is  tight and does not fade in any audio?

Personally, I use ZERO cross fading. And the reason was simple;
It didn't cross fade at all. All it did was fade out the current song,
then a short pause to start the next track. If your tracks are already
trimmed it does nothing and may even sound worse. 

What is the best crossfade time in second to set for a radio station without using too much CPU;one that is  tight and does not fade in any audio?

Crossfade at 5 secs
Crossmix at 1
Make sure your tracks are at least 10 seconds long

Hi
i m new where change setting crossfade! i did not find it in centovaCast
ThX

would be nice, if centova identify silence in the tracks, something below -25db, and jump to another track