I have the Pinebook Pro which is built upon the Rockchip RK3399 SoC incorporating a Mali T860 GPU. The Panfrost open source GPU driver written by the article's

I have the Pinebook Pro which is built upon the Rockchip RK3399 SoC incorporating a Mali T860 GPU. The Panfrost open source GPU driver written by the article's author offers support for this GPU, and on Linux Manjaro with KDE/Plasma the GPU-acceleration works, but for some reason I cannot figure out the performance is very low compared to what I've seen on other RK3399 demos running Linux. Anyone got any ideas what could be wrong?