diff --git a/arc_cache_test.go b/arc_cache_test.go
index f330e83..d9ffcfa 100644
--- a/arc_cache_test.go
+++ b/arc_cache_test.go
@@ -10,7 +10,9 @@ import (
 	blocks "github.com/ipfs/go-block-format"
 	cid "github.com/ipfs/go-cid"
 	ds "github.com/ipfs/go-datastore"
+	delaystore "github.com/ipfs/go-datastore/delayed"
 	syncds "github.com/ipfs/go-datastore/sync"
+	delay "github.com/ipfs/go-ipfs-delay"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 )
@@ -41,6 +43,17 @@ func createStores(t testing.TB) (*arccache, Blockstore, *callbackDatastore) {
 	return arc, bs, cd
 }
 
+func createStoresWithDelay(t testing.TB, delayed delay.D) (*arccache, Blockstore, *callbackDatastore) {
+	cd := &callbackDatastore{f: func() {}, ds: ds.NewMapDatastore()}
+	slowStore := delaystore.New(cd, delayed)
+	bs := NewBlockstore(syncds.MutexWrap(slowStore))
+	arc, err := testArcCached(context.TODO(), bs)
+	if err != nil {
+		t.Fatal(err)
+	}
+	return arc, bs, cd
+}
+
 func trap(message string, cd *callbackDatastore, t *testing.T) {
 	cd.SetFunc(func() {
 		t.Fatal(message)
@@ -318,32 +331,36 @@ func Benchmark_SimplePutDelete(b *testing.B) {
 }
 
 func Benchmark_ThrashPut(b *testing.B) {
-	arc, _, _ := createStores(b)
-
 	table := []struct {
 		numBlocks int
 		threads   int
+		delay     time.Duration
 	}{
 		{
 			numBlocks: 1_000_000,
 			threads:   1,
+			delay:     time.Millisecond * 1,
 		},
 		{
 			numBlocks: 1_000_000,
 			threads:   32,
+			delay:     time.Millisecond * 1,
 		},
 		{
 			numBlocks: 1_000_000,
 			threads:   64,
+			delay:     time.Millisecond * 1,
 		},
 		{
 			numBlocks: 1_000_000,
 			threads:   500,
+			delay:     time.Millisecond * 1,
 		},
 	}
 
 	for _, test := range table {
 		b.Run(fmt.Sprintf("%d_threads-%d_blocks", test.threads, test.numBlocks), func(b *testing.B) {
+			arc, _, _ := createStoresWithDelay(b, delay.Fixed(test.delay))
 			trace := make([]blocks.Block, test.numBlocks)
 			for i := 0; i < test.numBlocks; i++ {
 				token := make([]byte, 4)
@@ -386,32 +403,36 @@ func Benchmark_ThrashPut(b *testing.B) {
 }
 
 func Benchmark_ThrashGet(b *testing.B) {
-	arc, _, _ := createStores(b)
-
 	table := []struct {
 		numBlocks int
 		threads   int
+		delay     time.Duration
 	}{
 		{
 			numBlocks: 1_000_000,
 			threads:   1,
+			delay:     time.Millisecond * 1,
 		},
 		{
 			numBlocks: 1_000_000,
 			threads:   32,
+			delay:     time.Millisecond * 1,
 		},
 		{
 			numBlocks: 1_000_000,
 			threads:   64,
+			delay:     time.Millisecond * 1,
 		},
 		{
 			numBlocks: 1_000_000,
 			threads:   500,
+			delay:     time.Millisecond * 1,
 		},
 	}
 
 	for _, test := range table {
 		b.Run(fmt.Sprintf("%d_threads-%d_blocks", test.threads, test.numBlocks), func(b *testing.B) {
+			arc, _, _ := createStoresWithDelay(b, delay.Fixed(test.delay))
 			trace := make([]blocks.Block, test.numBlocks)
 			for i := 0; i < test.numBlocks; i++ {
 				token := make([]byte, 4)
@@ -454,32 +475,36 @@ func Benchmark_ThrashGet(b *testing.B) {
 }
 
 func Benchmark_ThrashDelete(b *testing.B) {
-	arc, _, _ := createStores(b)
-
 	table := []struct {
 		numBlocks int
 		threads   int
+		delay     time.Duration
 	}{
 		{
 			numBlocks: 1_000_000,
 			threads:   1,
+			delay:     time.Millisecond * 1,
 		},
 		{
 			numBlocks: 1_000_000,
 			threads:   32,
+			delay:     time.Millisecond * 1,
 		},
 		{
 			numBlocks: 1_000_000,
 			threads:   64,
+			delay:     time.Millisecond * 1,
 		},
 		{
 			numBlocks: 1_000_000,
 			threads:   500,
+			delay:     time.Millisecond * 1,
 		},
 	}
 
 	for _, test := range table {
 		b.Run(fmt.Sprintf("%d_threads-%d_blocks", test.threads, test.numBlocks), func(b *testing.B) {
+			arc, _, _ := createStoresWithDelay(b, delay.Fixed(test.delay))
 			trace := make([]blocks.Block, test.numBlocks)
 			for i := 0; i < test.numBlocks; i++ {
 				token := make([]byte, 4)
diff --git a/go.mod b/go.mod
index 64675b4..cb44afe 100644
--- a/go.mod
+++ b/go.mod
@@ -6,6 +6,7 @@ require (
 	github.com/ipfs/go-block-format v0.0.3
 	github.com/ipfs/go-cid v0.0.7
 	github.com/ipfs/go-datastore v0.4.2
+	github.com/ipfs/go-ipfs-delay v0.0.0-20181109222059-70721b86a9a8
 	github.com/ipfs/go-ipfs-ds-help v1.0.0
 	github.com/ipfs/go-ipfs-util v0.0.2
 	github.com/ipfs/go-log v0.0.1
diff --git a/go.sum b/go.sum
index cc30010..a9befeb 100644
--- a/go.sum
+++ b/go.sum
@@ -20,6 +20,7 @@ github.com/ipfs/go-datastore v0.4.1 h1:W4ZfzyhNi3xmuU5dQhjfuRn/wFuqEE1KnOmmQiOev
 github.com/ipfs/go-datastore v0.4.1/go.mod h1:SX/xMIKoCszPqp+z9JhPYCmoOoXTvaa13XEbGtsFUhA=
 github.com/ipfs/go-datastore v0.4.2 h1:h8/n7WPzhp239kkLws+epN3Ic7YtcBPgcaXfEfdVDWM=
 github.com/ipfs/go-datastore v0.4.2/go.mod h1:SX/xMIKoCszPqp+z9JhPYCmoOoXTvaa13XEbGtsFUhA=
+github.com/ipfs/go-ipfs-delay v0.0.0-20181109222059-70721b86a9a8 h1:NAviDvJ0WXgD+yiL2Rj35AmnfgI11+pHXbdciD917U0=
 github.com/ipfs/go-ipfs-delay v0.0.0-20181109222059-70721b86a9a8/go.mod h1:8SP1YXK1M1kXuc4KJZINY3TQQ03J2rwBG9QfXmbRPrw=
 github.com/ipfs/go-ipfs-ds-help v1.0.0 h1:bEQ8hMGs80h0sR8O4tfDgV6B01aaF9qeTrujrTLYV3g=
 github.com/ipfs/go-ipfs-ds-help v1.0.0/go.mod h1:ujAbkeIgkKAWtxxNkoZHWLCyk5JpPoKnGyCcsoF6ueE=