Default Whatsapp delay receiving notifications on CyanogenMod Galaxy Nexus

Hey guys!

I'm experiencing a delay receiving msgs on whatsapp since i have flashed CM11 Snapshot M2 on my galaxy nexus....i tried turning on the mobile sync when on wifi to receive msgs...it solved the problem but i need a permanent solution for this problem .....while installing whatsapp they notify us that there are too many app killers installed on the device which may delay the receiving of msgs but i have only 1 .....if there are any pre-installed app killers on CM 11 then plzz tell me so that i can turn them off temporarily....And plzzz tell me other solutions too

Plzz Help