In some cases GL rendering is not really useful, such as on machines without GPU. In those cases currently Mesa's llvmpipe is used, introducing CPU and RAM usage increase compared to the non-gl rendering path. For these cases the user could set a new env var, allowing the player to use the Cairo sink.
Created attachment 433399 [details] Patch
Committed r279873 (239626@main): <https://commits.webkit.org/239626@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 433399 [details].
<rdar://problem/80522853>