Question on Clamscan and SpamAssassin

[AZMel]

Is it normal for a system to run like this?

Tasks: 238 total,  30 running, 201 sleeping,   0 stopped,   7 zombie
Cpu(s): 97.3% us,  2.7% sy,  0.0% ni,  0.0% id,  0.0% wa,  0.0% hi,  0.0% si
Mem:   2053692k total,  1352876k used,   700816k free,    99640k buffers
Swap:  3903784k total,    13448k used,  3890336k free,   230188k cached

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
13542 asmith    20   0 56352  26m 2212 R  6.6  1.3   0:00.50 spamassassin
13494 breily    20   0 56352  26m 2212 R  5.0  1.3   0:00.50 spamassassin
13568 ccowan    25   0  7964 1416  712 R  4.3  0.1   0:00.26 clamscan
13450 tlawrenc  19   0 31172  24m  724 R  3.7  1.2   0:01.34 clamscan
13443 rray      19   0 31048  23m  724 R  3.3  1.2   0:01.34 clamscan
13468 dbodine   20   0 56352  26m 2212 R  3.3  1.3   0:00.49 spamassassin
13472 tstover   20   0 56352  26m 2212 R  3.3  1.3   0:00.50 spamassassin
13478 dbodine   20   0 56344  26m 2212 R  3.3  1.3   0:00.49 spamassassin
13482 mirizarr  20   0 56344  26m 2212 R  3.3  1.3   0:00.51 spamassassin
13498 jmartine  20   0 56352  26m 2212 R  3.3  1.3   0:00.49 spamassassin
13502 asmith    20   0 56352  26m 2212 R  3.3  1.3   0:00.50 spamassassin
13506 ecarpent  20   0 56344  26m 2212 R  3.3  1.3   0:00.49 spamassassin
13510 jmartine  20   0 56580  27m 2212 R  3.3  1.4   0:00.49 spamassassin
13514 breily    20   0 56344  26m 2212 R  3.3  1.3   0:00.51 spamassassin
13518 tlawrenc  20   0 56340  26m 2212 R  3.3  1.3   0:00.51 spamassassin
13522 postmast  21   0 56340  26m 2212 R  3.3  1.3   0:00.50 spamassassin
13526 borman    20   0 56344  26m 2212 R  3.3  1.3   0:00.49 spamassassin
13530 rray      20   0 56352  26m 2212 R  3.3  1.3   0:00.49 spamassassin
13534 donpope   20   0 56352  26m 2212 R  3.3  1.3   0:00.52 spamassassin
13538 ccowan    20   0 56340  26m 2212 R  3.3  1.3   0:00.50 spamassassin
13546 office    20   0 56344  26m 2212 R  3.3  1.3   0:00.51 spamassassin
13550 borman    20   0 56352  26m 2212 R  3.3  1.3   0:00.52 spamassassin
13554 donpope   20   0 56348  26m 2212 R  3.3  1.3   0:00.50 spamassassin
13569 postmast  19   0  7968 1416  712 R  3.3  0.1   0:00.39 clamscan
13359 tstover   19   0 32756  25m  804 R  3.0  1.3   0:01.53 clamscan
13365 ecarpent  19   0 32756  25m  804 R  3.0  1.3   0:01.53 clamscan
13419 mirizarr  19   0 31304  24m  724 R  3.0  1.2   0:01.33 clamscan
13583 office    20   0 23256 8700 1692 R  3.0  0.4   0:00.09 spamassassin
 9803 root      16   0 28400 2420 1864 R  0.3  0.1   0:00.43 sshd
29726 root      16   0 10784 1508  940 R  0.3  0.1   0:05.68 top
    1 root      16   0  2632  560  476 S  0.0  0.0   0:00.59 init
    2 root      34  19     0    0    0 S  0.0  0.0   0:00.00 ksoftirqd/0
    3 root      10  -5     0    0    0 S  0.0  0.0   0:00.07 events/0
    4 root      10  -5     0    0    0 S  0.0  0.0   0:00.01 khelper
    5 root      10  -5     0    0    0 S  0.0  0.0   0:00.00 kthread
    7 root      20  -5     0    0    0 S  0.0  0.0   0:00.00 kacpid
   84 root      10  -5     0    0    0 S  0.0  0.0   0:00.10 kblockd/0
   87 root      15   0     0    0    0 S  0.0  0.0   0:00.00 khubd
  122 root      20  -5     0    0    0 S  0.0  0.0   0:00.00 aio/0
  121 root      15   0     0    0    0 S  0.0  0.0   0:00.21 kswapd0
  707 root      15   0     0    0    0 S  0.0  0.0   0:00.01 kseriod
 2932 root      10  -5     0    0    0 S  0.0  0.0   0:01.04 reiserfs/0
 3109 root      16  -4  4784  600  492 S  0.0  0.0   0:00.13 udevd
 4843 root      25   0     0    0    0 S  0.0  0.0   0:00.00 shpchpd_event

In trying to debug a bad update I noticed my system running slower than normal and e-mail taking more than 20 minutes to arrive. I am running on dual AMD64's with 2GB of ram. Let me know your thoughts.

Thanks,
Mel