ut2004 vs. pci-e vs. linux

[Ossilator]

moin,

so i unearthed this relic called unreal tournament 2004.
unfortunately, it runs rather slowly, given the machine ...
the clue is most likely this:

Log: WARNING: Couldn't allocate AGP memory - turning off support for GL_NV_vertex_array_range
Log: WARNING: This has a serious impact on performance.

now, i'm not overly surprised by the message as such, as pci-e is obviously not agp. though i wonder whether the driver should not offer some abstraction layer? or is the game just broken in having a hard dependency on agp memory? any ideas for tweaks/patches/whatever?