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I can’t seem to find anything that slows my iPad Pro 3 down. The A12X was such a beast, (still is crushing competitors.) So, how much more powerful and efficient will the A14X be?
It might have more Processing Cores, a Higher Clock Speed, and a better GPU. It could also be more Power Efficient.

The A12z in my New iPad Pro is super fast, similar to your A12X. I don’t think I’m gonna need a faster Processor, this one is gonna be fine for a few years.
 
Finally upgraded my iPad Air 2 to an iPad Pro 2020. I get the impression Apple are leveraging their ownership of the silicon to completely over spec everything. Looking at the performance/price of the thing, I think it's getting harder and harder to level the "Veblen Goods" argument at Apple's core products.
 
how much more powerful and efficient will the A14X be?
It will probably be very powerful (and this is just the regular A14).
Screen Shot 2020-08-24 at 12.12.24 PM.png
 
The IPad Pro 2018/2020 with their A12x/z processors are absolute powerhouses on par with 15” MacBook Pro’s, with the iPad Air 3/Mini (A12) also being very powerful, but the the benchmark for the A14 is just Insane. Cant even imagine what the A14X will be?!?

Yes, the A14X will be incredibly powerful.
 
The A10x chip in my 10.5" iPad Pro is still plenty fast. It rarely slows down no matter how much I throw at it - I probably won't be upgrading anytime in the near future.
I agree. I don’t have my iPad Pro 10.5 anymore. I upgraded to the 2018 iPad Pro last month. However I used both side by side and in terms of speed there was no difference I could see. Same with my iPad mini 5th gen.
 
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