Good to hear that at least the knot is working fine now.
I've already spent huge amount of time reducing the lag in the big egg before the initial release. Sorry, there is literally nothing else I can do without deleting large chunks of the egg.
Driving inside the egg seems to run fine on my computer, which isn't particularly new or powerful (6 year old non-gaming laptop) and I think Reegad said he gets no lag there either. So I am thinking it is a problem on your end? Have you tried closing all other applications before running the map? If nothing else, I can show how to cheat (location of jetpack M16) so you can cap the end flags and enjoy the rest of the content without having to cap the Egg flag.
How does the Egg run for other people? Is it playable or a laggy mess for you?