Originally Posted by billplummer
Installed stock through fastboot, no improvement
Mhm. Can we see the entire terminal output of the flashing process, please?
Also, run 'adb logcat -c', then reboot the device. after booting, post/attach the entire log, maybe there's some throttling in there.
Can you try running some benchmarks against the cpu and the nand? Perhaps we could compare to our devices, not many comparisons would be needed ofc, but maybe just give us an idea if there's really something wrong with the hardware - if the values obtained on the benchs are too different.