Page lookups slower when use css11506?!

I have configured one armed test load balancing for L4 (http) as below:
service web-test1
ip address 10.10.10.253
keepalive type tcp
keepalive port 8100
active
service test2
ip address 10.10.10.254
keepalive type tcp
keepalive port 8100
active
owner WEB-Farm
content http-test
vip address 10.10.1.56
add service web-test1
add service web-test2
balance aca
port 8100
protocol tcp
active
group http-test-group
vip address 10.10.1.56
add destination service web-test1
add destination service web-test2
active
Our test result shows it slow than just software load balancing on http server.
Please confirm if my configuration is right?
If so, is one arm configuration will slow the lookup speed?
if not, what is the problem can be? and how to deb the problem?
Any comment will be appreciated
Thanks in advance

Great thanks for the reply.
it is a new setupped test environment.
The test staff said:
I did notice some strange behaviour that may/may not be related to this problem. The test going through the CISCO switch took a very long time to 'ramp-up' it processing - i.e. it was about 25-30 minutes of basically very slow processing and then later on it sped up.
Is possible I need change some option?
Is possible there is spanning tree problem?
It is not routing problem because the box is configured static routing ( all to next hop - cisco route)
It hardly to belive it is web server problem, because the test use same servers for both tests, that is load balance thought css11506 and thought a software resident inside one of web server.
Why it is slow at first half hour and than it sped up?

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