I will have to do some thinking… I can’t remember that I’ve seen any similar issues reported before. However with that many passengers I am actually surprised you’re getting 10 to 15 FPS… you should have been with us before Alpha 29…
Then again, your WindowServer value is also highly inflated. It shouldn’t be able to eat up 4 GB like that. As Rubble said all values seem to be quite high, maybe you have some weird setting prioritizing dumping RAM load on a virtual memory (your SSD for example) rather than the physical RAM. While ich nicht sprachen sie guten deutch I can see that your system seems to use 2.25 GB of physical RAM and then around 19 GB on the virtual side which is… strange, and excessive.
So What is Virtual Memory?
Your Mac comes with a limited amount of physical memory (RAM) installed by default. Memory is critical to any computer to run applications and carry out all the operations commanded by the user. Memory must be as fast as possible (and it helps to have as much as possible) to maximise your Mac’s performance; thankfully, prices have drastically fallen in recent years. Nevertheless, every computer has a finite amount of memory so Mac OS X might actually need to use more than is physically available on your system.
This is where virtual memory comes in – you can think of it as a kind of extension to the real memory on your system, albeit much slower because it is in fact physical space on your hard disk (or SSD, if you have one installed). Let’s say that you have 4 GB of main memory on your Mac and a 512 GB hard disk. If Mac OS X needs to use all 4 GB of main memory, it can still make use of any free space on your hard disk as an extension to that memory. Unfortunately, virtual memory is much slower than the physical RAM installed in your computer, because hard disks cannot match the speed of memory chips.