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I have installed the server according to the tutorial in the wiki.

I don't think it is a memory problem.

The server has 9 GB of RAM and 4 GB free disk space:

df -h
/dev/sda1        19G     15G  4,0G   79% /

This is in idle mode:

top - 07:11:33 up 19:00,  4 users,  load average: 0.31, 0.19, 0.10
Tasks: 104 total,   1 running, 103 sleeping,   0 stopped,   0 zombie
Cpu(s):  0.3%us,  0.0%sy,  0.0%ni, 98.7%id,  1.0%wa,  0.0%hi,  0.0%si,  0.0%st
Mem:   8991808k total,  2252904k used,  6738904k free,   237624k buffers
Swap:  1046524k total,        0k used,  1046524k free,  1002044k cached

This is while evaluating a worksheet with many graphic outputs:

top - 07:12:24 up 19:01,  4 users,  load average: 0.50, 0.24, 0.13
Tasks: 104 total,   1 running, 103 sleeping,   0 stopped,   0 zombie
Cpu(s):  9.7%us,  0.7%sy,  0.0%ni, 86.6%id,  3.0%wa,  0.0%hi,  0.0%si,  0.0%st
Mem:   8991808k total,  2253868k used,  6737940k free,   237672k buffers
Swap:  1046524k total,        0k used,  1046524k free,  1002236k cached