Ram is shared with the gpu, let that be a thought.
It is. For the most part though, it's the memory bandwidth that matters more for speed and not the amount that's installed.
These results were taken from AnandTech.
GFXBench Manhattan ES 3.0 Onscreen Ave FPS
56.1 iPhone 6s (A9, 2GB 1ch LPDDR4, 1334*750, 1MP)
35.7 iPad Pro 9.7 (A9X, 2GB 1ch LPDDR4, 2048*1536, 3.1MP)
33.2 iPad Pro 12.9 (A9X, 4GB 2ch LPDDR4, 2732*2048, 5.6MP)
27.2 iPad Air 2 (A8X, 2GB 2ch LPDDR3, 2048*1536, 3.1MP)
26.7 iPhone 5s (A7, 1136*640, 0.7MP)
26.1 iPhone 6 (A8, 1334*750, 1MP)
8.8 iPad Air (A7, 1GB 1ch LPDDR3, 2048*1536, 3.1MP)
GFXBench T-Rex HD Onscreen Ave FPS
59.4 iPad Pro 12.9 (A9X, 2732*2048, 5.6MP)
59.0 iPhone 6s (A9, 1334*750, 1MP)
52.4 iPad Air 2 (A8X, 2048*1536, 3.1MP)
49.6 iPhone 6 (A8, 1334*750, 1MP)
40.9 iPhone 5s (A7, 1136*640, 0.7MP)
21.2 iPad Air (A7, 2048*1536, 3.1MP)
I think it's pretty interesting that the Air 2 just barely tops iPhone 5s performance in the Manhattan Onscreen bench. Also interesting is the hierarchy of A9/A9X devices. Despite having 4GB of dual channel RAM, the Pro 12.9 sits at the bottom of the pile due to its much higher resolution. Even the Pro 9.7 with 2GB of single channel RAM edges it out a wee bit. Meanwhile, the 6s is sitting pretty at the top delivering almost 60FPS.
Of course, if you choose a fixed resolution, you can compare the relative raw performance among these devices and the picture changes drastically. Kind of a moot point though since the GPU has to be able to drive the display/screen resolution it comes with.
GFXBench Manhattan ES 3.0 Offscreen 1080p (2.1MP) Ave FPS
80.0 iPad Pro 12.9 (A9X, 4GB 2ch LPDDR4, 2732*2048, 5.6MP)
50.8 iPad Pro 9.7 (A9X, 2GB 1ch LPDDR4, 2048*1536, 3.1MP)
40.1 iPhone 6s (A9, 2GB 1ch LPDDR4, 1334*750, 1MP)
37.8 iPad Air 2 (A8X, 2GB 2ch LPDDR3, 2048*1536, 3.1MP)
18.2 iPhone 6 (A8, 1334*750, 1MP)
13.1 iPhone 5s (A7, 1136*640, 0.7MP)
13.0 iPad Air (A7, 1GB 1ch LPDDR3, 2048*1536, 3.1MP)
You realize iOS 8 was buggy in general and the Air is still really fine on iOS 10. Glad you got the Air 2 though it is really nice it ushered in the iPads that are now surpassing laptop performance. Hmmm? Maybe by iOS 12 it'll start to lag
Surpassing laptop performance? On pure processing power, the Air 2 just barely matches up with Intel Atom. The Pro 9.7 can match Intel Core microarchitecture but only the low-power chips designed for tablets and ultraportables.
Granted, Windows is bloated so for overall system performance, even the iPad 3 tends to be more responsive than the average PC with slow HDD or crappy SSD. If one has a higher clocked dual core or quad core workstation with decent SSD and at least 8GB RAM, even the iPad Pros don't come close. General performance on light tasks will be the same but raw number crunching would go to the workstation.