[One (M8) Android Development] imonxda:
Firstly, I want to say that I have nothing but respect and gratitude towards devs like @Claymore1297 , I wouldn't dream of offending or insulting or posting baseless negative comments about their hard work.

Secondly, I do know how to handle installing and using custom roms and all that goes with that, short of being a dev myself. Yes, I'm using the latest build, no, I am not exaggerating or carelessly throwing out negative comments like "same issues, unusable, black rectangle". I am using the device right now as I write this, and I've flashed this build a few times and tested it multiple times, and there is nothing wrong with my device hardware-wise.

Here is what happens on my M8WL: Fresh install, no gapps, I get to first unlock and everything is perfect, same with a reboot. Then after the first screen off/ON/unlock, it gets laggy - less laggy then with the first build, but still laggy AND battery seems to drain if I leave it with screen off faster than the 16.1 with screen off.

The difference between responsiveness at first screen on after boot and after first lock/unlock, is HUGE still. Even the AICP default live wallpaper that moves as you move your phone, starts to stagger and not move smoothly, especially when you swipe notifications away, or open recents, or even exiting settings will cause a visible lag where the settings icon fills the screen for about half-second, then disappears, then you get stuttering whallpaper motion - while it is tottaly smooth right after a fresh boot - this is the best indicator that there is still some major lag issue.

I DO see the black rectangle, though less often than with first build, I get it when swipe down notifications, then quickly swipe up to close notifications - if I repeat this maybe 2 or 3 times I will see the black rectangle. With first build, I would see the black rectangle all the time if I swiped anything, now with new build I only see it as I described, so that's improved, but not resolved.

I can see that the rectangle is simply a result of lag, it's just a visual artifact popping up as gpu/cpu gets bogged down, not that I would know what to do about it, or the cause :) , I'm no dev, but its definitelly from the lag - if you can find the thing that causes lag after screen off/on, then I think all problems would go away.

So it still makes the rom overall unusable because I would have to charge it every day even if I'm not using it, and the lag is still too heavy to play a game or run some system intensive app or whatever - so no lag=never turn off screen=unusable because of drain battery too fast, burn my always-on screen, or, turn off/on screen=lag=I wouldn't want to use it, kind of unusable - this is what I mean by that word, not that the rom is so broken that it is tottaly unusable, I never mean that.

I just rebooted right now and have been opening as much stuff as I can as fast as I can: swiping app drawer, home screen, notifications, recents open/close apps - I SEE ABSOLUTELLY NO LAG OR PERFORMANCE PROBLEMS AT ALL. As soon as I turn off screen and back on, then it behaves exactly as described above - the point is, it's something to do with unlocking screen, or coming out of sleep mode or something, and that's about as helpful as my limited knowledge will allow me to be - pretty sad, actually, if I was better, I could look at the logs and maybe help you spot the issue.