More memory?

I have a p4 2.4 with 512mb ram now, it runs pretty well speed is good but its slugish even with a load of .05 mysql is a pretty big deal on there it has about 26 customers. You think more memory will help with the sluggish response. The ping time on it is around 60 at th most even during peak times. How much more 256 or 512?

Below is my top:

15:18:03 up 1 day, 21:33, 2 users, load average: 1.66, 1.05, 0.91
236 processes: 232 sleeping, 2 running, 2 zombie, 0 stopped
CPU states: cpu user nice system irq softirq iowait idle
total 7.6% 0.4% 5.1% 0.0% 0.0% 0.0% 86.8%
Mem: 447932k av, 428136k used, 19796k free, 0k shrd, 15508k buff
239068k active, 148916k inactive
Swap: 1048784k av, 171204k used, 877580k free 98424k cached

PID USER PRI NI SIZE RSS SHARE STAT %CPU %MEM TIME CPU COMMAND

 

 

 

 

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