[superjeff]

TfSEO enabled, heavy:

[root@hserver ~]# ab -n 100  http://hserver/tfseo_1/main-forum-f2/dsadas-t4
This is ApacheBench, Version 2.0.40-dev <$Revision: 1.146 $> apache-2.0
Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Copyright 2006 The Apache Software Foundation, http://www.apache.org/

Benchmarking hserver (be patient).....done


Server Software:        Apache/2.2.3
Server Hostname:        hserver
Server Port:            80

Document Path:          /tfseo_1/main-forum-f2/dsadas-t4
Document Length:        33804 bytes

Concurrency Level:      1
Time taken for tests:   22.177687 seconds
Complete requests:      100
Failed requests:        0
Write errors:           0
Total transferred:      3420400 bytes
HTML transferred:       3380400 bytes
Requests per second:    4.51 [#/sec] (mean)
Time per request:       221.777 [ms] (mean)
Time per request:       221.777 [ms] (mean, across all concurrent requests)
Transfer rate:          150.60 [Kbytes/sec] received

Connection Times (ms)
              min  mean[+/-sd] median   max
Connect:        0    0   0.0      0       0
Processing:   220  221   0.7    221     223
Waiting:      209  210   0.8    210     213
Total:        220  221   0.7    221     223

Percentage of the requests served within a certain time (ms)
  50%    221
  66%    221
  75%    222
  80%    222
  90%    222
  95%    222
  98%    223
  99%    223
 100%    223 (longest request)

TfSEO disabled, standart vburl:

[root@hserver ~]# ab -n 100  http://hserver/tfseo_1/showthread.php?p=4#post4
This is ApacheBench, Version 2.0.40-dev <$Revision: 1.146 $> apache-2.0
Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Copyright 2006 The Apache Software Foundation, http://www.apache.org/

Benchmarking hserver (be patient).....done


Server Software:        Apache/2.2.3
Server Hostname:        hserver
Server Port:            80

Document Path:          /tfseo_1/showthread.php?p=4#post4
Document Length:        34010 bytes

Concurrency Level:      1
Time taken for tests:   21.870820 seconds
Complete requests:      100
Failed requests:        0
Write errors:           0
Total transferred:      3441000 bytes
HTML transferred:       3401000 bytes
Requests per second:    4.57 [#/sec] (mean)
Time per request:       218.708 [ms] (mean)
Time per request:       218.708 [ms] (mean, across all concurrent requests)
Transfer rate:          153.63 [Kbytes/sec] received

Connection Times (ms)
              min  mean[+/-sd] median   max
Connect:        0    0   0.0      0       0
Processing:   216  218   0.9    218     220
Waiting:      205  207   0.9    208     209
Total:        216  218   0.9    218     220
WARNING: The median and mean for the waiting time are not within a normal deviat                                                                                                 ion
        These results are probably not that reliable.

Percentage of the requests served within a certain time (ms)
  50%    218
  66%    218
  75%    219
  80%    219
  90%    219
  95%    219
  98%    220
  99%    220
 100%    220 (longest request)

Like you can see product takes about +10ms per request. Try edit plugin cutting the query in forumhome, that could be the problem.