If I write a bash script which iterates 100 times over both scripts I get following results:

You comparing not just the times of sending request, but also the times of scripts compiling. First script imports LWP and JSON, and second only JSON. Look onto my test results: 

$ time (for i in `seq 1 100`; do perl -MJSON -e1; done)

real    0m2.635s
user    0m1.930s
sys    0m0.510s

$ time (for i in `seq 1 100`; do perl -MJSON -MLWP::UserAgent -e1; don
+e)

real    0m7.111s
user    0m6.060s
sys    0m0.740s

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In reply to Re: Why is LWP::UserAgent so slow? by zwon
in thread Why is LWP::UserAgent so slow? by smetj

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