graphics lags on zoom in and out * (g and h )

Hello Guys …
BEEN A CUBASE PC USER BETWEEN 2005 / 2012…
SWITCHED TO MAC SINCE 2012 AND I LOVE IT…
ONLY ONE PROBLEM I ALWAYS NEVER SEEM TO FIX …
THE ZOOM IN AND OUT G & H ARE LAGGING IN PARTS WITH MORE DETAILED NUMBER OF IMPORTED AUDIO…
FOR INSTANCE WHEN THE KICK CHANNEL IS ON THE DISPLAYS…
I ALWAYS THOGHT ITS BECOSE I USED TO WORK ON A LAP TOP MAC BOOK PRO ITS BECOUSE IT HAS A BAD GRAPHICS CARD…
SO I RECENTLY BOGHT THE MAC PRO 6 CORE , 32 RAM WITH MONSTER PCIE 500 TERRA SSD…
BUT GUESS WHAT THE PROBLEM IS NOT SOLVED …
IT HELPES IF I REDUSE THE SCALING OPTIONS TO A LOWER RESLUTION BUT IT SUCKS TO SEE IT LIKE THAT AND THERE NOT ENOGH ROOM RO WORK THAT WAY…
SERCHED THE FORUM FOR MANY YEARS NOW AND ALL THE ANSWERS ARE SO VAGE ABOUT IT …
PLZ HELP

JOHN