Why is my Request so slow from SoapUI (SLA Problem)

Hi, 

I' m new to REST  and SoapUI  so please don't be to angry about my stupid questions.

I use SoapUI 5.0.0 32bit on Windows 7 64bit 

I have a problem with the response time check (SLA ) when I do a simple test case with a GET request to the unit under test and a SLA(5000) it fails in 95% of the tries becaus it takes longer than the 5sec.

When I do it with FF 36 and RestClient addon on the same machine it feels like 1-2 sec  (do not know how to measur).

And when I use wget on a Linux VM the time command says it take 1.8 - 2.5 sec every time (20x) see below.

So my questions is why is the same request with SOAPUI so slow?

here the Linux VM outout.

user# time wget "https://username:password@172.16.25.245:3031" --no-check-certificate
--2015-04-29 11:12:28--  https://username:*password*@172.16.25.245:3031/
Connecting to 172.16.25.245:3031... connected.
WARNING: cannot verify 172.16.25.245's certificate,
 issued by "/C=DE/ST=B/L=City/O=TestCenter/CN=www.testcenter.local":
  Self-signed certificate encountered.
    WARNING: certificate common name BLABLA doesn't match requested host name 172.16.25.245.
HTTP request sent,
 awaiting response... 401 Unauthorized
Reusing existing connection to 172.16.25.245:3031.
HTTP request sent,
 awaiting response... 200 OK
Length: unspecified [application/json]
Saving to: "index.html.1"
   [ <=> ] 1.320       --.-K/s   in 0s
2015-04-29 11:12:30 (41,5 MB/s) - "index.html.1" saved [1320]

real    0m1.874s
user    0m0.009s
sys     0m0.003s