[Seaside] Linux Seaside server problem

[Seb]

Hi,
We develop a Seaside application and we're doing some stress tests on it.

Context
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We run a 3.9.7-10 VM on a Debian Sarge server.
We start it with -nodisplay and -nosound options.

Our stress test is simple: only display a basic Seaside page.

Our Seaside server is a 2 GHz CPU with 1 GB of RAM.

Problem
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Our image freezes within 2 seconds, with as low as 20 concurrent users 
hitting once per second.

I can't even connect to the image with REPLServer after the freeze.

Then we try to stress the same image on a Windows server with the VM 
coming from the current 3.8 Windows package: it easily supports 150+ 
concurrent users hitting once per second...

Questions
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Did anyone have a similar experience?

I heard of a 3.6 VM being more stable for Unix / Linux systems. Is it 
usable with a 3.9 image?

Is there a debian package for the 3.9-8 VM?

Should we use a Windows server for Squeak?

Thanks !
Seb.