Hmmmmmm, I did my "fun" experiment using relatively powerful CPU - ....
Yes, you are absolutely correct, I take this back. To my ears, the brighter top-end of FLAC remains regardless of the PC.
To me, it seems like all lossless formats have problems with the top-end extension and "life", some more, some less.
I think I will be ending my "lossless" journey here; I am sticking to WAV!
Most important: Enjoy the music!
Best,
Alex Peychev