there's your answer [:)] perhaps not, but it seems likely to me.
Even though it is slow to appear, have a look under "Reporting -> Hardware" on the WebAdmin. You will see how much RAM is used and how much % of available processor is used. If these are high then it confirms that the PC is not powerful enough.
I use Celeron 500 ~ 650mhz, Intel 810 Motherboard (Supermicro), 128mb RAM and cheap PCI network cards. Complete machine costs only around £280 (GB Pounds). Nice
I'd have to agree with Tom and carlywarly , at the very least increase your RAM to 128MB.. Simms are quite cheap these days, you can usually pick up 16 or 32MB SIMMS for under $25 a stick at swap meets and such.
I run two Astaro boxes at home, one for a DSL feed and the other for a cable modem. Both are dual processor P200's w/128MB of RAM. The interface is a bit slow, but livable.