Modern YouTube forces the VP9 video codec on high-resolution videos, which older CPUs cannot decode in hardware. Version 5.9.0.13 primarily used , which any GPU from 2010 onward could accelerate. Result? Buttery smooth 720p and 1080p playback on old hardware.
At the time of its launch, version 5.9.0.13 was a significant update that aimed to refine the user experience. Its primary contribution was the broader rollout of the . youtube version 5.9.0.13