Oh you don't auctually need any more ram.
You have 1GB ram total, 500MB of it is in cache and your swap is only used for non active files. Your server traffic/load will have to double before you require any more ram.
If you're finding your forum to be lagging, make sure that whoever you're hosting with has a good backbone network because you can have the best server in the world but if you're connected through a clogged line it's gonna go slow. If it's not the network that's the problem, check the CPU. If it is the CPU then APC will fix that. If it's not the CPU it could be your iowait (hard drive) at which point you can disable logging or put logging and mysql on another server or get a RAID setup (i recommend raid 10)
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