Well, the only possibilities are the diffs (posted earlier) from v279 to v280, which added synchronous access control to threads trying to write to the display controller. I suspect this "enforced serialization" is slowing things on in-car players for certain combinations of player setttings.

So, Hijack v333 now only enforces the access control when Hijack itself wants to write to the display controller -- to do this, it still has to track the player's accesses, and force those to wait when Hijack is in there, and vice versa.

Maybe this will help.

Cheers