lol...asked a shop owner b4 about what d difference between the so called high speed cable with regular rm5 or rm10 one?? he leisurely answered " same like ori cable bro " ....lol...

what if i have 2amp power supply, a phone capable receiving that , but cable that can only deliver around 500mili amp or less?

You talk nonsense because you lack knowledge.

There are 3 main factors that determine the speed for standard charging :
1) The charger's current delivery capability.
2) The connecting cable resistance & voltage drop.
3) The device current draw capability.

Cable is just one part of the equation whether fast charging works or not.
All 3 must works together at the same time to achieve fast charging.

Plugging in a 2.0A charger to my cheap 0.5A draw smartphone will still charge it in 4 hours, not 1 hour as you claimed regardless whether I use a fast charging cable or not.

Do your research & experiments before saying everything else is nonsense.