Actually i have found the culprit of the scenery stuttering, it was my 4k monitor overclock, ive put it back to its native 60hz and now the sim is butter smooth like in that video above, i cant believe what a difference, DCS 2.5 is a marvel , everything at full and its just incredibly smooth!
By the way, my two other monitors are just getting me some shade, i am not using them, only 4k.