2020 12.9" ipad pro charging: Fastest charging

Hi All,

I have a 2020 12.9” iPad Pro (4th gen). At what wattage does “fast charging” top out? Does the Apple 30w charger charge said iPad Pro any faster than the 18w charger that it comes with? What is the difference in the charging speed between the 18w charger, and those that produce more electricity to the iPad? At what wattage does the “fast charging” cease? In other words; yes, you can charge the iPad Pro with a 96w Apple charger, but it won’t charge the iPad Pro any faster than (once again) “x” watt charger.

Thanks!

Laurence M. Schwarz