Multiple parellel requests to a soap api are taking collectively longer time

[super-engineer]

I'm trying to send three parallel request to a soap api. Normally each request takes around 13 seconds to complete so for three requests it takes around 39 seconds. After using parallel gem and sending three parallel requests using 3 threads it takes around 23 seconds to complete all three requests which is really nice but I'm not able to figure out why its not completing it in like 14-15 seconds. Its not an issue actually but as you know alot about parallel processing so I thought maybe you can point me in the right direction.

[grosser]

The endpoint could be slower when it's hit by multiple requests at a time or maybe your network connection is bad :)
You could do a something like this to get deeper insights

puts "Start"
puts(Benchmark.realtime do
   do-api-call
end)
puts "STOP"