Temple level frame rate slows to a crawl

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The frame rate on this level goes down to 10. It is virtually impossible to play and I've put all the graphics settings on low. All sound settings as low as possible. Screen resolution to 800x600. I've even tried all the preference settings layed out in the sticky topic in this category. I disabled reatime and hardware sound as well. It doesn't seem to change the frame rate much (+5) from when I have it maxed out.

EDIT: The level is fine when reset but if an island becomes heavily infect with virii and red darwinians the problem happens.

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Darwinia 1.3

Windows XP Professional x64 Edition
DirectX 9.0c (4.09.0000.0904)

AMD Athlon 64 Processor 3400+, ~2.2GHz
Abit AV8/AV8-3rd Eye Motherboard
1024 MB DDR SDRAM
ATI RADEON X800 (256 MB)
Creative SoundBlaster X-Fi

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Anyway, I restarted the level and beat it fairly quickly so the frame rate stayed over 170.

Darwinia is the best game I've ever played. I'm sad that its over