The ZenFone 3 Zoom has 3GB of RAM and a Snapdragon 625 chipset which are enough to provide excellent daily performance and for multitasking not to be a problem. There's no lag or stuttering.
The Zoom has a 5.5", 1,1080p AMOLED display clad. The resolution works out to a 401ppi. The panel has rich and saturated colors out of the box, though you also can tweak color temperatures as you like.