Operating system: Linux-4.15.0-47-generic-x86_64-with-debian-buster-sid 64 Bits
Graphics card: Radeon RX Vega ATI Technologies Inc. 4.5.13542 Core Profile Context 126.96.36.1998
Broken: (example: 2.80, 860a9f979d60, master, 2018-04-14, as found on the splash screen)
Short description of error
The performance is ridiculously slow with ROCm 2.3 kernels, though they compile even at the same speed as the pro drivers. Not sure if report this to ROCm's project page too, it's compiling after all.
Exact steps for others to reproduce the error