diff --git a/ants.go b/ants.go
index 7c51439..5f1166c 100644
--- a/ants.go
+++ b/ants.go
@@ -1,6 +1,6 @@
 package ants
 
-const DEFAULT_POOL_SIZE = 50000
+const DEFAULT_POOL_SIZE = 5
 
 var defaultPool = NewPool(DEFAULT_POOL_SIZE)
 
diff --git a/ants_benchmark_test.go b/ants_benchmark_test.go
index 8246a32..029c768 100644
--- a/ants_benchmark_test.go
+++ b/ants_benchmark_test.go
@@ -6,7 +6,7 @@ import (
 	"sync"
 )
 
-const RunTimes = 10000
+const RunTimes = 100000
 
 func BenchmarkPoolGroutine(b *testing.B) {
 	for i := 0; i < b.N; i++ {
diff --git a/pool.go b/pool.go
index 50e4a09..b53afbf 100644
--- a/pool.go
+++ b/pool.go
@@ -76,24 +76,41 @@ func (p *Pool) reachLimit() bool {
 }
 
 func (p *Pool) newWorker() *Worker {
+	var w *Worker
 	if p.reachLimit() {
 		<-p.freeSignal
 		return p.getWorker()
 	}
-	worker := &Worker{
-		pool: p,
-		task: make(chan f),
+	wp := p.workerPool.Get()
+	if wp == nil {
+		w = &Worker{
+			pool: p,
+			task: make(chan f),
+		}
+	} else {
+		w = wp.(*Worker)
 	}
-	worker.run()
+	w.run()
 	atomic.AddInt32(&p.running, 1)
-	return worker
+	return w
 }
 
 func (p *Pool) getWorker() *Worker {
-	if w := p.workerPool.Get(); w != nil {
-		return w.(*Worker)
+	var w *Worker
+	p.m.Lock()
+	workers := p.workers
+	n := len(workers) - 1
+	if n < 0 {
+		p.m.Unlock()
+		return p.newWorker()
+	} else {
+		w = workers[n]
+		workers[n] = nil
+		p.workers = workers[:n]
+		atomic.AddInt32(&p.running, 1)
 	}
-	return p.newWorker()
+	p.m.Unlock()
+	return w
 }
 
 func (p *Pool) putWorker(worker *Worker) {
diff --git a/worker.go b/worker.go
index 1cd5949..ed13b39 100644
--- a/worker.go
+++ b/worker.go
@@ -9,22 +9,6 @@ type Worker struct {
 	task chan f
 }
 
-//func (w *Worker) run() {
-//	go func() {
-//		for {
-//			select {
-//			case f := <-w.task:
-//				f()
-//				w.pool.putWorker(w)
-//				w.pool.wg.Done()
-//			case <-w.exit:
-//				atomic.AddInt32(&w.pool.running, -1)
-//				return
-//			}
-//		}
-//	}()
-//}
-
 func (w *Worker) run() {
 	go func() {
 		for f := range w.task {