Performance hit using groovy-stream.

AddPrimes.groovy

//Project Euler # 10
//http://projecteuler.net/problem=10

@Grab(group='org.gperfutils', module='gbench', version='0.4.2-groovy-2.1')
@Grab( 'com.bloidonia:groovy-stream:0.6.2' )

import groovy.stream.Stream
import groovyx.gbench.Benchmark

def usingStream(){
    def isPrime = {n->
         for (int i=2;i<n;i++) {
            if (n%i==0) return false
         }
         
         true
    }

    Stream s = Stream.from 2..200000 filter {isPrime(it)}
    println s.collect().sum()
}

def isPrime(num, primes) {
    primes.find { it <= Math.sqrt(num) && it != 1 && it != num && num % it == 0 } == null
}

def oldAddPrimes(){
    def primes = []
    def min = 2
    def max = 200000

    (min..max).findAll { it % 2 == 1 || it == 2 }.each { i ->
        if (isPrime(i, primes))
        {
            primes.add(i);
        }
    }
    
    println primes.sum() //1709600813
}

def addAllPrimes(){
    def primes = 0
    def min = 2
    def max = 200000

    (min..max).each { x ->
        if ((2..Math.sqrt(x)).every{x % it != 0}) {
            primes += x
        }
    }
    
    println primes //1709600811
}

def r = benchmark{
    'Stream'{usingStream()}
    'oldAdd'{oldAddPrimes()}
    'newAdd'{addAllPrimes()}
}

r.prettyPrint()

//Output
Environment
===========
* Groovy: 2.2.1
* JVM: Java HotSpot(TM) 64-Bit Server VM (23.1-b03, Oracle Corporation)
    * JRE: 1.7.0_05
    * Total Memory: 105.5625 MB
    * Maximum Memory: 113.8125 MB
* OS: Windows 7 (6.1, amd64)

Options
=======
* Warm Up: Auto (- 60 sec)
* CPU Time Measurement: On

1709600813
1709600813
1709600813
                user    system           cpu          real

Stream  106735856049  46821120  106782677169  109959313815
oldAdd   18111696454  15614468   18127310922   18704594910
newAdd    9562843119     13489    9562856608    9601082963