[jefftk]

> According to the screenshots of XMRig for android you only get about ~35H/s while my laptop does ~2400.

Is that for the specific proof of work algorithm mCaptcha uses? While I don't think you're going to get something that runs equally quickly on a low-end phone and high-end desktop, if it depends entirely on sequential operations and is not optimization-friendly you should be able to get much closer than 68x?

[manmal]

The screenshot here shows 117H/s, and I guess the Android version hasn’t been as heavily optimized: https://github.com/XMRig-for-Android/xmrig-for-android

I think we‘d need to compare apples to apples, and not use Monero mining as a benchmark for mCaptcha. Also, as I wrote in another comment, the average case (server is not under attack) is 0.02 seconds on a laptop, and probably 0.4s on an Android device even if we do use xmrig-android as comparison. Compare that to manually identifying stairs on pictures with crappy quality (10 seconds?).