I know it's been a few months but i've found the Solution, and it involves cheat engine.
What we knew :
Entrance fine, tower fine, univers slow, play mode slow.
we also knew thats the entrance were locked at 30 fps while the gameplay is supposed to be 60 fps.
the question was why it works in some game mods and not others ? and the answer is because theres a memory value that change to 30 or 60 depending the mode you are.
how did i find ?
1) played the ronda/sonya tower match with entrance. during the entrance i've look for 30 value in Cheat engine, during the match, (that was working great) i've scan again to remove all the changed values .
2) i went in play mode (exhbition) and replay the same match entrance fine, so i rescanned again to remove all the changed value again. (always keeping the 30)
then in the game play BAAMMMM!!!! slow motion, so i've look for 60 value
and an adress pop out. (green in cheat egine which mean it's constant and doesn't change every time you close the game)
So I tested and locked the 30 value to that adress started a match with entrance, entrance fine ... then .... slow motion gameplay .... i was desapointed and paused the game. i did an "alt tab" to go back to cheat engine en check, and when i came back to game .... Amazing !!! never a wwe game worked so well, no lag. EVEN in 8 Men ladder match. all settings at max. (and im playing on laptop intel core I5 et geforce GTX 950M)
I've tested in many configurations and modes and it works.
all needed is the locked address at value 30 and after the begining of the match, alt tab to desktop and back to game, unpause et voila
So all of it for a little adress that was annoying us all and not necessary a graphic cards problem.
Im 'not at home now and i dont have the adress in mine it is starting by 1425EXXXX ( on version 1.04)
Dont have much time to play these days thats why i shared the process to you.
If ever it can help someone.