FLServer or Discovery is … Lag? How to reduce as I can't add more power?

NeXoSE

You may know the story about my donation to a friend who likes to run a Discovery server previously.

If you don’t know, here is the whole story for reference:
http://the-starport.net/freelancer/forum/viewtopic.php?topic_id=4859
http://the-starport.net/freelancer/forum/viewtopic.php?topic_id=5580
http://the-starport.net/freelancer/forum/viewtopic.php?topic_id=5613

And now you can see:

The CPU is 100%, used by FLServer & the DSProcessManager (Normally 80 / 20, but the FLServer ran too high in that picture).

For those don’t want to guess that is those pictograph:

FLServer use 80% CPU and 461MB RAM (That VPS assigned 1GB of ram, single core), and CPU is almost 100% straight line.

I don’t actually know how many players online concurrently, but as i saw they had 44 players changed their saving file in past 2 hours, i could guess that about 15?

OK, now, I got little problem on financial, because I preparing myself to go to a large city in China for work and adventure, so i cannot offer a VPS better than that because i had limited money. So, i want to know if there is some ways to reduce the use age of FLServer or Discovery?

Thank you.