High server load !webpage opens slowly??Do i need clustering ?

Hello All,
I have been monitoring the load on my server for quite some time.I have worked with Mysql optimization on server,indexing the tables etc.I have tested all my-huge,my-large etc file by naming them to my.cnf.
All along it the webpages on server opens very slowly despite all works.We have Red-hat 9,Intel Xeon processors(4 in number 3Ghz) with 2GB of RAM installed.
Here I am pasting my memory usage on server:
**********************************************
total used free shared buffers cached
Mem: 2064400 1761076 303324 0 258252 1293040
-/+ buffers/cache: 209784 1854616
Swap: 2096440 33400 2063040
Total: 4160840 1794476 2366364
**********************************************
Along with top output:
01:18:48 up 20 days, 23:54, 1 user, load average: 2.48, 1.75, 1.59
132 processes: 124 sleeping, 1 running, 7 zombie, 0 stopped
CPU0 states: 17.3% user 11.1% system 0.0% nice 0.0% iowait 70.4% idle
CPU1 states: 14.1% user 6.4% system 0.0% nice 0.0% iowait 78.3% idle
CPU2 states: 19.1% user 6.0% system 0.0% nice 0.0% iowait 74.2% idle
CPU3 states: 17.0% user 4.2% system 0.0% nice 0.0% iowait 78.1% idle
Mem: 2064400k av, 1761680k used, 302720k free, 0k shrd, 258252k buff
983400k actv, 20928k in_d, 37420k in_c
Swap: 2096440k av, 33400k used, 2063040k free 1294180k cached

PID USER PRI NI SIZE RSS SHARE STAT %CPU %MEM TIME CPU COMMAND
1973 mysql 15 0 22608 22M 2092 S 45.3 1.0 0:18 2 mysqld
30077 root 24 0 4028 4028 2916 S 3.1 0.1 0:16 2 httpd
15782 nobody 24 0 0 0 0 Z 0.7 0.0 0:00 1 httpd <defunct>
1364 root 15 0 1328 1328 900 R 0.5 0.0 0:01 1 top
15779 nobody 25 0 0 0 0 Z 0.3 0.0 0:00 3 httpd <defunct>
15787 nobody 25 0 0 0 0 Z 0.3 0.0 0:00 0 httpd <defunct>
15793 nobody 24 0 0 0 0 Z 0.3 0.0 0:00 0 httpd <defunct>
15795 nobody 24 0 0 0 0 Z 0.3 0.0 0:00 2 httpd <defunct>
143 root 15 0 0 0 0 SW 0.1 0.0 9:57 0 kjournald
15794 nobody 25 0 0 0 0 Z 0.1 0.0 0:00 3 httpd <defunct>
1 root 15 0 124 76 56 S 0.0 0.0 0:38 0 init
2 root RT 0 0 0 0 SW 0.0 0.0 0:00 0 migration/0
3 root RT 0 0 0 0 SW 0.0 0.0 0:00 1 migration/1
4 root RT 0 0 0 0 SW 0.0 0.0 0:00 2 migration/2
5 root RT 0 0 0 0 SW 0.0 0.0 0:00 3 migration/3
6 root 15 0 0 0 0 SW 0.0 0.0 0:02 3 keventd
7 root 34 19 0 0 0 SWN 0.0 0.0 0:10 0 ksoftirqd_CPU0
8 root 34 19 0 0 0 SWN 0.0 0.0 0:01 1 ksoftirqd_CPU1

We are currently reached to limit of resource usage on the server as per my knowledge.I need to resolve the load ,slow webpage opening issue asap.
CAn anybody tell me what should I do to lower the load?What could be the main reson for slow webpage opening ?Should I need a clustering of the server?OR else?
The site name is studiotraffic.com.
Anybody to verify and please let me know!!
Thank you

 

 

 

 

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