Server running SLOW thanks to high-traffic site, what to do?

I have a semi-managed web server, with about 40 active sites on it.
Most of them are pretty low-traffic (less than 20 unique visitors a
day), but one site (mine) has roughly 6,000 unique visitors a day. The
load is really dragging the server speed down, and I simply don't know
what to do!

The server is:

GenuineIntel Celeron CPU 2.40GHz
Cache size: 128 KB
RAM: 1G

The OS is RedHat Enterprise 4 i686.


When I run "servup" through "Web Host Manager" (WHM), this is what it
tells me right now:

cpsrvd up
named (9.2.4) up
Server Load 4.88 (1 cpu)
Memory Used 33.1 %
Swap Used 15.37 %
Disk hda7 (/) DMA+ 17 %
Disk hda1 (/boot) DMA+ 12 %
Disk hda5 (/home) DMA+ 8 %
Disk hda6 (/tmp) DMA+ 5 %
Disk hda2 (/usr) DMA+ 49 %
Disk hda3 (/var) DMA+ 47 %

I can't honestly say that I understand this report, though.

I suspect that my bottleneck is coming from the CPU, which is a
2.4GHz. But the site doesn't really make enough money to pay for much
of an upgrade. Is there anything I can do on my end to speed things
up?

Am I correct in guessing that the CPU is the bottleneck? I emailed the
management company (The Planet) about adding a second CPU to cut the
load in half, but so far they haven't replied.

TIA,

Jason

.

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