why performance increase after pause?

The voice coil theory is plausible I suppose.

Maybe the wires "relax" and the re-surgence of electron flow re-establishes the path as fresh. Maybe not just the wires but everything in the signal path as well benefits from a pause. I haven't ever noticed this phenomenon but haven't ever listened for it either, but you have me curious. I will say that the second side of an LP always sounds better after the cartridge has a warmup period.
Are you just noticing it on you CDP? Could it be clocking related? Just some random thoughts...but, isn't that what forums are for?

you reset your ears and brain just like PC.

I remember reading about this with CDPs many years ago in one of the major stereo mags at the time. It went something like starting your selection and pausing just before it played and then continuing playback. It was said to be more dynamic sounding.

I just thought it had something to do with getting up to speed or something getting in sync. Or something to that effect. When I tried it, it seemed to sound louder or hit harder, but back then I was more impressionable than I am now.

I'm surprised to see this come up again as I would think that by now this would not be happening, attributable to early hardware. As I write this it comes to mind that I was listening to Coplands "Fanfare For The Common Man" on my good old Phillips CD-80 when I tested this. Those tympani drums did seem to hit harder.

All the best,
Nonoise

It is obvious you have been infected by the audio affliction often referred to as 'imaginary' hearing. It come to all of us very early in our audio lives. Best to ignore it by selling off the offending piece of equipment. That way you can move on to your next imaginary experience.