I've also noticed this on those maps. I've just recently upped my memory to 1024megs & it run smooth now. No stumbles or hangups.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Gigabyte GA-7VAXP Athlon XP 2400+ 1024megs ( 2 x 512 ) Corsiar PC2700 ASUS V9280 Geforce4 Ti4200 128MB 120gig IBM Deskstar Windoze XP Pro SP1a
I have AMD 2600 512mb 64mb Geforce 4 and I've noticed it too. I also have a little lag on DC. I thought it must be the Jets. I'm going to upgrade to 1gig of mem, hope that fixes it.