LiteSpeed Support Forums - Why LSWS slower than Apache 1.3 on my server ?

/usr/local/apache/bin/ab -n 500 -c 10 localhost:82/index.php

Server Software: Apache/1.3.34
Document Path: /index.php
Document Length: 34672 bytes

Concurrency Level: 10
Time taken for tests: 8.577 seconds
Complete requests: 500
Failed requests: 39
(Connect: 0, Length: 39, Exceptions: 0)
Broken pipe errors: 0
Total transferred: 17448165 bytes
HTML transferred: 17306165 bytes
Requests per second: 58.30 [#/sec] (mean)
Time per request: 171.54 [ms] (mean)
Time per request: 17.15 [ms] (mean, across all concurrent requests)
Transfer rate: 2034.30 [Kbytes/sec] received

Connnection Times (ms)
min mean[+/-sd] median max
Connect: 0 0 1.0 0 23
Processing: 26 169 97.5 153 648
Waiting: 25 168 97.6 153 648
Total: 26 169 97.6 153 648

Percentage of the requests served within a certain time (ms)
50% 153
66% 181
75% 212
80% 225
90% 288
95% 362
98% 460
99% 549
100% 648 (last request)

/usr/local/apache/bin/ab -n 500 -c 10 localhost/index.php

Server Software: LiteSpeed
Server Port: 80

Document Path: /index.php
Document Length: 34672 bytes

Concurrency Level: 10
Time taken for tests: 9.484 seconds
Complete requests: 500
Failed requests: 28
(Connect: 0, Length: 28, Exceptions: 0)
Broken pipe errors: 0
Total transferred: 17530433 bytes
HTML transferred: 17457258 bytes
Requests per second: 52.72 [#/sec] (mean)
Time per request: 189.68 [ms] (mean)
Time per request: 18.97 [ms] (mean, across all concurrent requests)
Transfer rate: 1848.42 [Kbytes/sec] received

Connnection Times (ms)
min mean[+/-sd] median max
Connect: 0 0 0.0 0 1
Processing: 28 186 98.8 167 666
Waiting: 28 186 98.7 167 665
Total: 28 186 98.8 167 666
ERROR: The median and mean for the initial connection time are more than twice the standard
deviation apart. These results are NOT reliable.

Percentage of the requests served within a certain time (ms)
50% 167
66% 207
75% 240
80% 265
90% 310
95% 368
98% 441
99% 536
100% 666 (last request)

I already repeated this test with different -n and -c numbers but apache is faster than Lite Speed (standart) at all tests.

For example: with ab -n 1000 -c 1 options, got following results:
with Apache:
Requests per second: 35.84 [#/sec] (mean)
Time per request: 27.91 [ms] (mean)
Time per request: 27.91 [ms] (mean, across all concurrent requests)
Transfer rate: 1252.68 [Kbytes/sec] received

with LSWS:
Requests per second: 33.04 [#/sec] (mean)
Time per request: 30.27 [ms] (mean)
Time per request: 30.27 [ms] (mean, across all concurrent requests)
Transfer rate: 1150.26 [Kbytes/sec] received

I installed LSWS with default options. LS SAPI & TurckMMCache has been installed and php files runs correctly but slower than apache. I'm not using any php accelerator with Apache. (php version is: 4.3.11 with Apache)

What's wrong? What should i do? This server has ~300.000 unique visitors daily and i'm looking for more performance according to Apache..

Thanks