Do hitboxes matter in Skyriding races?

It feels much, much easier to play with smaller mounts, and in fact, even easier to just fly in butterfly form as druid.

Now, is that just because I see more of what’s ahead, or is there also a difference with hitboxes too? I know for a fact that hitboxes matter for mounts, for example in Warsong Gunch you can’t enter the cave with really tall mounts, so does the same apply to skyriding races?

On another note, Skyriding seems really laggy in the Ringing Deeps specifically. Is there any effect that I should turn down/off?