diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index cdf4c1d..92946b2 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -1,5 +1,8 @@
 name: test
 on: [push]
+permissions:
+  contents: write
+  pull-requests: write
 jobs:
   test:
     name: test
@@ -11,13 +14,56 @@ jobs:
         uses: actions/setup-go@v5
         with:
           go-version-file: go.mod
+      
       - name: test
         run: make test
+      
       - name: generate test coverage
         run: make generate-coverage
+      
       - name: check test coverage
+        id: coverage
         uses: vladopajic/go-test-coverage@v2
         with:
           config: ./.testcoverage.yml
           git-branch: badges
           git-token: ${{ github.ref_name == 'main' && secrets.GITHUB_TOKEN || '' }}
+      
+      # Post coverage report as comment
+      - name: find pull request ID
+        run: |
+          PR_DATA=$(curl -s -H "Authorization: token ${{ secrets.GITHUB_TOKEN }}" \
+            "https://api.github.com/repos/${{ github.repository }}/pulls?head=${{ github.repository_owner }}:${{ github.ref_name }}&state=open")
+          PR_ID=$(echo "$PR_DATA" | jq -r '.[0].number')
+          
+          if [ "$PR_ID" != "null" ]; then
+            echo "pull_request_id=$PR_ID" >> $GITHUB_ENV
+          else
+            echo "No open pull request found for this branch."
+          fi
+      - name: find if coverage report is already present
+        if: env.pull_request_id
+        uses: peter-evans/find-comment@v3
+        id: fc
+        with:
+          issue-number: ${{ env.pull_request_id }}
+          comment-author: 'github-actions[bot]'
+          body-includes: 'go-test-coverage report:'
+      - name: post coverage report
+        if: env.pull_request_id
+        uses: peter-evans/create-or-update-comment@v4
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          issue-number: ${{ env.pull_request_id }}
+          comment-id: ${{ steps.fc.outputs.comment-id }}
+          body: |
+            go-test-coverage report:
+            ```
+            ${{ fromJSON(steps.coverage.outputs.report) }}
+            ```
+          edit-mode: replace
+      
+      - name: "finally check coverage"
+        if: steps.coverage.outcome == 'failure'
+        shell: bash
+        run: echo "coverage check failed" && exit 1
\ No newline at end of file
diff --git a/.testcoverage.yml b/.testcoverage.yml
index e0ac485..28344e8 100644
--- a/.testcoverage.yml
+++ b/.testcoverage.yml
@@ -4,4 +4,5 @@
 profile: cover.out
 local-prefix: "github.com/vladopajic/go-actor"
 threshold:
+  file: 100
   total: 100
diff --git a/Makefile b/Makefile
index 8c4f792..c6ee41c 100644
--- a/Makefile
+++ b/Makefile
@@ -13,6 +13,11 @@ install-golangcilint:
 lint: install-golangcilint
 	$(GOLANGCI_LINT) run ./...
 
+# Runs benchmark on entire repo
+.PHONY: benchmark
+benchmark:
+	go test -benchmem -count 5 -run=^# -bench=. github.com/vladopajic/go-actor/actor
+
 # Runs tests on entire repo
 .PHONY: test
 test: 
diff --git a/README.md b/README.md
index 0c14724..7316b07 100644
--- a/README.md
+++ b/README.md
@@ -119,7 +119,6 @@ While `go-actor` is designed to be a minimal library with lean interfaces, devel
 
 - [super](https://github.com/vladopajic/go-super-actor): An add-on for unifying the testing of actors and workers.
 - [commence](https://github.com/vladopajic/go-actor-commence): An add-on that provides a mechanism for waiting for actor execution to begin.
-- [netbox](https://github.com/vladopajic/go-actor-netbox): Mailbox implemented with different network functionality.
 
 
 ## Pro Tips
diff --git a/actor/combine.go b/actor/combine.go
index 531bcb6..303c67f 100644
--- a/actor/combine.go
+++ b/actor/combine.go
@@ -30,6 +30,11 @@ type CombineBuilder struct {
 // The returned Actor will manage the lifecycle of each underlying Actor,
 // allowing you to start or stop them collectively.
 func (b *CombineBuilder) Build() Actor {
+	if len(b.actors) == 0 {
+		options := combinedOptionsToRegularList(b.options.Combined)
+		return Idle(options...)
+	}
+
 	a := &combinedActor{
 		actors:       b.actors,
 		onStopFunc:   b.options.Combined.OnStopFunc,
@@ -108,7 +113,6 @@ func (a *combinedActor) Stop() {
 		a.ctx = nil
 	}
 
-	a.running = false
 	a.runningLock.Unlock()
 
 	for _, actor := range a.actors {
@@ -208,3 +212,17 @@ func (a *wrappedActor) Stop() {
 	a.actor.Stop()
 	a.onStopFunc()
 }
+
+func combinedOptionsToRegularList(combined optionsCombined) []Option {
+	var options []Option
+
+	if fn := combined.OnStartFunc; fn != nil {
+		options = append(options, OptOnStart(fn))
+	}
+
+	if fn := combined.OnStopFunc; fn != nil {
+		options = append(options, OptOnStop(fn))
+	}
+
+	return options
+}
diff --git a/actor/combine_test.go b/actor/combine_test.go
index b5a00da..39d1d2e 100644
--- a/actor/combine_test.go
+++ b/actor/combine_test.go
@@ -11,21 +11,33 @@ import (
 func Test_Combine_TestSuite(t *testing.T) {
 	t.Parallel()
 
-	const actorsCount = 10
+	TestSuite(t, func() Actor {
+		actors := createActors(0)
+		return Combine(actors...).Build()
+	})
 
 	TestSuite(t, func() Actor {
-		actors := createActors(actorsCount)
+		actors := createActors(1)
+		return Combine(actors...).Build()
+	})
 
+	TestSuite(t, func() Actor {
+		actors := createActors(10)
 		return Combine(actors...).Build()
 	})
 }
 
-// Test asserts that all Start and Stop is
-// delegated to all combined actors.
+// Test asserts that all Start and Stop is delegated to all combined actors.
 func Test_Combine(t *testing.T) {
 	t.Parallel()
 
-	const actorsCount = 5
+	testCombine(t, 0)
+	testCombine(t, 1)
+	testCombine(t, 5)
+}
+
+func testCombine(t *testing.T, actorsCount int) {
+	t.Helper()
 
 	onStartC := make(chan any, actorsCount)
 	onStopC := make(chan any, actorsCount)
@@ -46,43 +58,20 @@ func Test_Combine(t *testing.T) {
 	assert.Len(t, onStopC, actorsCount)
 }
 
-// Test_Combine_OptStopTogether asserts that all actors will end as soon
-// as first actors ends.
-func Test_Combine_OptStopTogether(t *testing.T) {
+func Test_Combine_OptOnStopOptOnStart(t *testing.T) {
 	t.Parallel()
 
-	const actorsCount = 5 * 2
-
-	for i := range actorsCount/2 + 1 {
-		onStartC := make(chan any, actorsCount)
-		onStopC := make(chan any, actorsCount)
-		onStart := OptOnStart(func(Context) { onStartC <- `🌞` })
-		onStop := OptOnStop(func() { onStopC <- `🌚` })
-		actors := createActors(actorsCount/2, onStart, onStop)
-
-		// append one more actor to actors list
-		cmb := Combine(createActors(actorsCount/2, onStart, onStop)...).Build()
-		actors = append(actors, cmb)
-
-		a := Combine(actors...).WithOptions(OptStopTogether()).Build()
-
-		a.Start()
-		drainC(onStartC, actorsCount)
-
-		// stop actor and assert that all actors will be stopped
-		actors[i].Stop()
-		drainC(onStopC, actorsCount)
-	}
+	testCombineOptOnStopOptOnStart(t, 0)
+	testCombineOptOnStopOptOnStart(t, 1)
+	testCombineOptOnStopOptOnStart(t, 5)
 }
 
-func Test_Combine_OptOnStopOptOnStart(t *testing.T) {
-	t.Parallel()
-
-	const actorsCount = 5
+func testCombineOptOnStopOptOnStart(t *testing.T, count int) {
+	t.Helper()
 
 	onStatC, onStartOpt := createCombinedOnStartOption(t, 1)
 	onStopC, onStopOpt := createCombinedOnStopOption(t, 1)
-	actors := createActors(actorsCount)
+	actors := createActors(count)
 
 	a := Combine(actors...).
 		WithOptions(onStopOpt, onStartOpt).
@@ -96,6 +85,42 @@ func Test_Combine_OptOnStopOptOnStart(t *testing.T) {
 	a.Stop() // should have no effect
 	assert.Equal(t, `🌚`, <-onStopC)
 	assert.Equal(t, `🌞`, <-onStatC)
+	assert.Empty(t, onStopC)
+	assert.Empty(t, onStatC)
+}
+
+// Test_Combine_OptStopTogether asserts that all actors will end as soon
+// as first actors ends.
+func Test_Combine_OptStopTogether(t *testing.T) {
+	t.Parallel()
+
+	// no need to test OptStopTogether for actors count < 2
+	// because single actor is always "stopped together"
+
+	testCombineOptStopTogether(t, 1)
+	testCombineOptStopTogether(t, 2)
+	testCombineOptStopTogether(t, 10)
+}
+
+func testCombineOptStopTogether(t *testing.T, actorsCount int) {
+	t.Helper()
+
+	for i := range actorsCount {
+		onStartC := make(chan any, actorsCount)
+		onStopC := make(chan any, actorsCount)
+		onStart := OptOnStart(func(Context) { onStartC <- `🌞` })
+		onStop := OptOnStop(func() { onStopC <- `🌚` })
+		actors := createActors(actorsCount, onStart, onStop)
+
+		a := Combine(actors...).WithOptions(OptStopTogether()).Build()
+
+		a.Start()
+		drainC(onStartC, actorsCount)
+
+		// stop actor and assert that all actors will be stopped
+		actors[i].Stop()
+		drainC(onStopC, actorsCount)
+	}
 }
 
 func Test_Combine_OptOnStop_AfterActorStops(t *testing.T) {
diff --git a/actor/mailbox_benchmark_test.go b/actor/mailbox_benchmark_test.go
index c6aaf5d..f5649ca 100644
--- a/actor/mailbox_benchmark_test.go
+++ b/actor/mailbox_benchmark_test.go
@@ -38,20 +38,14 @@ func benchmarkMailbox(b *testing.B, mbx Mailbox[any]) {
 	mbx.Start()
 	defer mbx.Stop()
 
-	doneC := make(chan any)
-
 	go func() {
+		ctx := ContextStarted()
 		for range b.N {
-			<-mbx.ReceiveC()
+			mbx.Send(ctx, `🌞`) //nolint:errcheck // error should never happen
 		}
-
-		close(doneC)
 	}()
 
-	ctx := ContextStarted()
 	for range b.N {
-		mbx.Send(ctx, `🌞`) //nolint:errcheck // error should never happen
+		<-mbx.ReceiveC()
 	}
-
-	<-doneC
 }
diff --git a/actor/mailbox_test.go b/actor/mailbox_test.go
index 6c09e6b..531fca3 100644
--- a/actor/mailbox_test.go
+++ b/actor/mailbox_test.go
@@ -26,7 +26,7 @@ func Test_FromMailboxes(t *testing.T) {
 
 	// After combined Agent is started all Mailboxes should be executing
 	for _, m := range mm {
-		assertSendReceive(t, m, `🌹`)
+		assertSendReceiveAsync(t, m, `🌹`)
 	}
 
 	a.Stop()
@@ -86,7 +86,7 @@ func Test_FanOut(t *testing.T) {
 
 	// Assert that Mailbox actor is still working
 	for _, m := range fanMbxx {
-		assertSendReceive(t, m, `🌹`)
+		assertSendReceiveAsync(t, m, `🌹`)
 	}
 }
 
@@ -107,7 +107,7 @@ func Test_MailboxWorker_EndSignal(t *testing.T) {
 func Test_Mailbox_Invariants(t *testing.T) {
 	t.Parallel()
 
-	AssertMailboxInvariantsBuffered(t, func() Mailbox[any] {
+	AssertMailboxInvariantsAsync(t, func() Mailbox[any] {
 		return NewMailbox[any]()
 	})
 }
@@ -204,32 +204,24 @@ func Test_Mailbox_AsChan(t *testing.T) {
 		t.Parallel()
 
 		m := NewMailbox[any](OptAsChan())
-
-		assert.ErrorIs(t, m.Send(ContextStarted(), `👹`), ErrMailboxNotStarted)
+		assertMailboxNotStarted(t, m)
 
 		m.Start()
 
 		assertSendBlocking(t, m)
 		assertReceiveBlocking(t, m)
-
-		// Send when there is receiver
-		go func() {
-			assert.NoError(t, m.Send(ContextStarted(), `🌹`))
-		}()
-		assert.Equal(t, `🌹`, <-m.ReceiveC())
-
-		// Because send is blocking, it must return error when context is canceled
-		assert.ErrorIs(t, m.Send(ContextEnded(), `🌹`), ContextEnded().Err())
+		assertSendWithCanceledCtx(t, m, true)
+		assertSendReceiveSync(t, m, `🌹`)
+		assertSendReceiveSync(t, m, nil)
 
 		m.Stop()
-
 		assertMailboxStopped(t, m)
 	})
 
 	t.Run("non zero cap", func(t *testing.T) {
 		t.Parallel()
 
-		AssertMailboxInvariantsBuffered(t, func() Mailbox[any] {
+		AssertMailboxInvariantsAsync(t, func() Mailbox[any] {
 			return NewMailbox[any](OptAsChan(), OptCapacity(1))
 		})
 	})
@@ -261,33 +253,21 @@ func Test_Mailbox_AsChan_SendStopped(t *testing.T) {
 	<-testDoneC
 }
 
-func AssertMailboxInvariantsBuffered(t *testing.T, mFact func() Mailbox[any]) {
+func AssertMailboxInvariantsAsync(t *testing.T, mFact func() Mailbox[any]) {
 	t.Helper()
 
 	t.Run("basic invariants", func(t *testing.T) {
 		t.Parallel()
 
 		m := mFact()
-
-		// Should not be able to send as Mailbox is not started
-		assert.ErrorIs(t, m.Send(ContextStarted(), `👹`), ErrMailboxNotStarted)
-
-		// Should have not data to receive
-		assertReceiveBlocking(t, m)
+		assertMailboxNotStarted(t, m)
 
 		m.Start()
-
-		// Should be able to send and receive value
-		assertSendReceive(t, m, `🌹`)
-
-		// Assert that sending nil value should't cause panic
-		assertSendReceive(t, m, nil)
-
-		assertSendWithCanceledCtx(t, m)
+		assertSendReceiveAsync(t, m, `🌹`)
+		assertSendReceiveAsync(t, m, nil)
+		assertSendWithCanceledCtx(t, m, false)
 
 		m.Stop()
-
-		// After Mailbox is stopped assert that all channels are closed
 		assertMailboxStopped(t, m)
 	})
 
@@ -295,26 +275,49 @@ func AssertMailboxInvariantsBuffered(t *testing.T, mFact func() Mailbox[any]) {
 		t.Parallel()
 
 		m := mFact()
+
 		m.Start()
 		m.Start()
-
-		assertSendReceive(t, m, `🌹`)
+		assertSendReceiveAsync(t, m, `🌹`)
 
 		m.Stop()
 		m.Stop()
-
 		assertMailboxStopped(t, m)
 
 		m.Start() // Should have no effect
 		assertMailboxStopped(t, m)
 	})
+
+	//nolint:testifylint // intentionally using ==
+	t.Run("receive channel is not changed", func(t *testing.T) {
+		t.Parallel()
+
+		m := mFact()
+		initialC := m.ReceiveC()
+
+		// when mailbox is started assert that ReceiveC is the same as initial
+		m.Start()
+		// sending some data to ensure that mbx has fully started
+		assertSendReceiveAsync(t, m, `🌹`)
+		assert.True(t, initialC == m.ReceiveC(), "expecting the same reference for ReceiveC")
+
+		// when mailbox is stopped assert ReceiveC should be the same as initial
+		m.Stop()
+		assert.True(t, initialC == m.ReceiveC(), "expecting the same reference for ReceiveC")
+	})
 }
 
-func assertSendWithCanceledCtx(t *testing.T, m Mailbox[any]) {
+// Asserts that sending with canceled context will end with error.
+func assertSendWithCanceledCtx(t *testing.T, m Mailbox[any], immediate bool) {
 	t.Helper()
 
-	// Assert that sending with canceled context will end with error.
-	// Since sendC has some buffer it is possible that some attempts will succeed.
+	// Because send is blocking, it must return error immediately
+	if immediate {
+		assert.ErrorIs(t, m.Send(ContextEnded(), `🌹`), ContextEnded().Err())
+		return
+	}
+
+	// Since sendC has some buffer it is possible that some attempts will succeed
 	for {
 		err := m.Send(ContextEnded(), `🌹`)
 		if err != nil {
@@ -322,18 +325,26 @@ func assertSendWithCanceledCtx(t *testing.T, m Mailbox[any]) {
 			return
 		}
 
-		// Drain message it went through
-		<-m.ReceiveC()
+		<-m.ReceiveC() // Drain message since it went through
 	}
 }
 
-func assertSendReceive(t *testing.T, m Mailbox[any], val any) {
+func assertSendReceiveAsync(t *testing.T, m Mailbox[any], val any) {
 	t.Helper()
 
 	assert.NoError(t, m.Send(ContextStarted(), val))
 	assert.Equal(t, val, <-m.ReceiveC())
 }
 
+func assertSendReceiveSync(t *testing.T, m Mailbox[any], val any) {
+	t.Helper()
+
+	go func() {
+		assert.NoError(t, m.Send(ContextStarted(), val))
+	}()
+	assert.Equal(t, val, <-m.ReceiveC())
+}
+
 func assertMailboxStopped(t *testing.T, m Mailbox[any]) {
 	t.Helper()
 
@@ -343,6 +354,15 @@ func assertMailboxStopped(t *testing.T, m Mailbox[any]) {
 	assert.False(t, ok)
 }
 
+func assertMailboxNotStarted(t *testing.T, m Mailbox[any]) {
+	t.Helper()
+
+	assert.ErrorIs(t, m.Send(ContextStarted(), `👹`), ErrMailboxNotStarted,
+		"should not be able to send as Mailbox is not started")
+
+	assertReceiveBlocking(t, m)
+}
+
 func assertReceiveBlocking(t *testing.T, m Mailbox[any]) {
 	t.Helper()
 
diff --git a/actor/queue.go b/actor/queue.go
index 9589974..51beb0e 100644
--- a/actor/queue.go
+++ b/actor/queue.go
@@ -5,14 +5,11 @@ import (
 )
 
 func newQueue[T any](capacity int) *queue[T] {
-	minimum := capacity
-	if minimum < minQueueCapacity {
-		minimum = minQueueCapacity
-	}
-
-	return &queue[T]{
-		q: queueImpl.New[T](capacity, minimum),
-	}
+	q := &queueImpl.Deque[T]{}
+	q.SetBaseCap(max(minQueueCapacity, capacity))
+	q.Grow(capacity)
+
+	return &queue[T]{q}
 }
 
 type queue[T any] struct {
diff --git a/actor/queue_test.go b/actor/queue_test.go
index 40c9115..b75d6a4 100644
--- a/actor/queue_test.go
+++ b/actor/queue_test.go
@@ -52,31 +52,27 @@ func TestQueue_Basic(t *testing.T) {
 func TestQueue_Cap(t *testing.T) {
 	t.Parallel()
 
-	{
-		q := NewQueue[any](10)
-		assert.Equal(t, MinQueueCapacity, q.Cap())
-		assert.Equal(t, 0, q.Len())
+	{ // push over capacity, then pop to zero
+		q := NewQueue[any](MinQueueCapacity / 2)
+		assert.Equal(t, MinQueueCapacity/2, q.Cap())
 
-		q.PushBack(`🌊`)
+		for range 2 * MinQueueCapacity {
+			q.PushBack(`🌊`)
+		}
 
-		assert.Equal(t, MinQueueCapacity, q.Cap())
-		assert.Equal(t, 1, q.Len())
-	}
+		assert.Equal(t, 2*MinQueueCapacity, q.Len())
+
+		for !q.IsEmpty() {
+			q.PopFront()
+		}
 
-	{
-		q := NewQueue[any](10)
 		assert.Equal(t, MinQueueCapacity, q.Cap())
 		assert.Equal(t, 0, q.Len())
 	}
 
-	{
+	{ // should used supplied capacity since value is larger then minimal
 		q := NewQueue[any](MinQueueCapacity * 2)
 		assert.Equal(t, MinQueueCapacity*2, q.Cap())
 		assert.Equal(t, 0, q.Len())
-
-		q.PushBack(`🌊`)
-
-		assert.Equal(t, MinQueueCapacity*2, q.Cap())
-		assert.Equal(t, 1, q.Len())
 	}
 }
diff --git a/go.mod b/go.mod
index a5a0199..e45d710 100644
--- a/go.mod
+++ b/go.mod
@@ -3,8 +3,8 @@ module github.com/vladopajic/go-actor
 go 1.23
 
 require (
-	github.com/gammazero/deque v0.2.1
-	github.com/stretchr/testify v1.9.0
+	github.com/gammazero/deque v1.0.0
+	github.com/stretchr/testify v1.10.0
 	go.uber.org/goleak v1.3.0
 )
 
diff --git a/go.sum b/go.sum
index 31f9443..fe3cac8 100644
--- a/go.sum
+++ b/go.sum
@@ -1,16 +1,16 @@
 github.com/creack/pty v1.1.9/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ33E=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
-github.com/gammazero/deque v0.2.1 h1:qSdsbG6pgp6nL7A0+K/B7s12mcCY/5l5SIUpMOl+dC0=
-github.com/gammazero/deque v0.2.1/go.mod h1:LFroj8x4cMYCukHJDbxFCkT+r9AndaJnFMuZDV34tuU=
+github.com/gammazero/deque v1.0.0 h1:LTmimT8H7bXkkCy6gZX7zNLtkbz4NdS2z8LZuor3j34=
+github.com/gammazero/deque v1.0.0/go.mod h1:iflpYvtGfM3U8S8j+sZEKIak3SAKYpA5/SQewgfXDKo=
 github.com/kr/pretty v0.1.0 h1:L/CwN0zerZDmRFUapSPitk6f+Q3+0za1rQkzVuMiMFI=
 github.com/kr/pretty v0.1.0/go.mod h1:dAy3ld7l9f0ibDNOQOHHMYYIIbhfbHSm3C4ZsoJORNo=
 github.com/kr/text v0.2.0 h1:5Nx0Ya0ZqY2ygV366QzturHI13Jq95ApcVaJBhpS+AY=
 github.com/kr/text v0.2.0/go.mod h1:eLer722TekiGuMkidMxC/pM04lWEeraHUUmBw8l2grE=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
-github.com/stretchr/testify v1.9.0 h1:HtqpIVDClZ4nwg75+f6Lvsy/wHu+3BoSGCbBAcpTsTg=
-github.com/stretchr/testify v1.9.0/go.mod h1:r2ic/lqez/lEtzL7wO/rwa5dbSLXVDPFyf8C91i36aY=
+github.com/stretchr/testify v1.10.0 h1:Xv5erBjTwe/5IxqUQTdXv5kgmIvbHo3QQyRwhJsOfJA=
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