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I found a way to speed up the brute force attack method, drop the hash160 conversion to address, because that conversion requires a SHA-256D, that is equal as mining bitcoin, now if we skip that part, what percentage can we gain in speed increase?

True. It's how Brainflayer and keyhunt in RMD160 mode work. Much much faster and results in the same output eventually. I wish bitcrack would update to rmd mode. Might double speed.

Are y'all talking about loading/searching for hash160 versus address? I ask because this comment kind of confused me, "drop the hash160 conversion to address".

Yes

Then you are correct. This has been known and Vanity, KeyhuntCuda, do in fact already do this. I’m not sure about bitcrack; I’d have to look at the code.

Yeah Bitcrack is a classic crack-the-privatekey-and-convert-to-full-address-then-compare-to-input-address thingy. It's fast and works on all GPU types, although it failed test on all RX 500 series 8GB GPUs for some reason. There is a random search version of it that generates millions of random sub-ranges and start seaching through them sequentially. Good stuff. Not fast enough compared to Vanbitcracken. If we can drop the convert-all-the-way-to-address process, this can save a lot of time by generating output faster. Keyhuntcuda is a great example for this.