open System.Net
open System.Diagnostics

use timer = new Stopwatch()
timer.Restart()

[
    for i in 1..1000 do
        yield
            async {
                let w = new WebClient()
                return w.DownloadString("http://localhost:5000/")
            }
]
|> Async.Parallel
|> Async.RunSynchronously

timer.Stop()
printfn "%+A" timer.ElapsedMilliseconds