Question about Display resolution

Hi,
i recently bought new monitor and im using default resolution which is 2560x1440 - up from my previous FullHD 1920x1080.

I noticed that spell effects when im close to them (say: Blizzard, Rain of Fire, couple of more spells) and by close to them i mean i zoom on them causes my fps drops even to 15 from 100 or so!

My question is, does my new resolution takes all my fps? I could normally pull 100~ fps with very little stutter or fps drops, but now sometimes it’s unplayble.

I tried running with no addons i even made a fresh installation of the game. Did not help. Drivers are up to date.

Im using GTX MSI Gaming X 1060, 6GB, i5 7600k and 16GB DDR4.

All WoW settings are on “7” as recommended, Vsync off.

Is this all i can pull on this config?