diff --git a/.github/workflows/test-integration.yml b/.github/workflows/test-integration.yml
index c7462a8d262..f47c4b0dcaa 100644
--- a/.github/workflows/test-integration.yml
+++ b/.github/workflows/test-integration.yml
@@ -24,6 +24,7 @@ jobs:
         os:
           - ubuntu-22.04
           - macos-14
+          - ubuntu-latest-erigontests-large
     runs-on: ${{ matrix.os }}
 
     steps:
@@ -37,7 +38,7 @@ jobs:
         run: sudo apt update && sudo apt install build-essential
 
       - name: test-integration
-        run: make test-integration
+        run: GOGC=50 make test-integration
 
   tests-windows:
     strategy:
diff --git a/tests/block_test.go b/tests/block_test.go
index 269dde4ab78..3003fd707a0 100644
--- a/tests/block_test.go
+++ b/tests/block_test.go
@@ -53,6 +53,7 @@ func TestBlockchain(t *testing.T) {
 	checkStateRoot := true
 
 	bt.walk(t, blockTestDir, func(t *testing.T, name string, test *BlockTest) {
+		t.Parallel()
 		// import pre accounts & construct test genesis block & state root
 		if err := bt.checkFailure(t, test.Run(t, checkStateRoot)); err != nil {
 			t.Error(err)
diff --git a/tests/difficulty_test.go b/tests/difficulty_test.go
index daab9e53e8e..c301d94ff70 100644
--- a/tests/difficulty_test.go
+++ b/tests/difficulty_test.go
@@ -28,8 +28,6 @@ import (
 )
 
 func TestDifficulty(t *testing.T) {
-	//t.Parallel()
-
 	dt := new(testMatcher)
 
 	dt.walk(t, difficultyTestDir, func(t *testing.T, name string, superTest map[string]json.RawMessage) {
diff --git a/tests/exec_spec_test.go b/tests/exec_spec_test.go
index d8ea375f79a..e93e660f97b 100644
--- a/tests/exec_spec_test.go
+++ b/tests/exec_spec_test.go
@@ -35,6 +35,7 @@ func TestExecutionSpec(t *testing.T) {
 	checkStateRoot := true
 
 	bt.walk(t, dir, func(t *testing.T, name string, test *BlockTest) {
+		t.Parallel()
 		// import pre accounts & construct test genesis block & state root
 		if err := bt.checkFailure(t, test.Run(t, checkStateRoot)); err != nil {
 			t.Error(err)
diff --git a/tests/init_test.go b/tests/init_test.go
index a3a28f110f1..27bbcda2ea1 100644
--- a/tests/init_test.go
+++ b/tests/init_test.go
@@ -228,7 +228,6 @@ func (tm *testMatcher) runTestFile(t *testing.T, path, name string, runTest inte
 			t.Skip("Skipped by whitelist")
 		}
 	}
-	//t.Parallel()
 
 	// Load the file as map[string]<testType>.
 	m := makeMapFromTestFunc(runTest)
@@ -289,7 +288,6 @@ func runTestFunc(runTest interface{}, t *testing.T, name string, m reflect.Value
 }
 
 func TestMatcherWhitelist(t *testing.T) {
-	//t.Parallel()
 	tm := new(testMatcher)
 	tm.whitelist("invalid*")
 	tm.walk(t, rlpTestDir, func(t *testing.T, name string, test *RLPTest) {
diff --git a/tests/rlp_test.go b/tests/rlp_test.go
index f6a907b2ade..25abe33f7e6 100644
--- a/tests/rlp_test.go
+++ b/tests/rlp_test.go
@@ -26,7 +26,6 @@ import (
 )
 
 func TestRLP(t *testing.T) {
-	//t.Parallel()
 	tm := new(testMatcher)
 	tm.walk(t, rlpTestDir, func(t *testing.T, name string, test *RLPTest) {
 		if err := tm.checkFailure(t, test.Run()); err != nil {
diff --git a/tests/state_test.go b/tests/state_test.go
index 7a5f9b93ddb..7199c444aac 100644
--- a/tests/state_test.go
+++ b/tests/state_test.go
@@ -39,12 +39,12 @@ import (
 )
 
 func TestState(t *testing.T) {
+	t.Parallel()
 	defer log.Root().SetHandler(log.Root().GetHandler())
 	log.Root().SetHandler(log.LvlFilterHandler(log.LvlError, log.StderrHandler))
 	if runtime.GOOS == "windows" {
 		t.Skip("fix me on win please") // it's too slow on win and stops on macos, need generally improve speed of this tests
 	}
-	//t.Parallel()
 
 	st := new(testMatcher)
 
diff --git a/tests/transaction_test.go b/tests/transaction_test.go
index 1b3ffd32837..af2b25d0a7b 100644
--- a/tests/transaction_test.go
+++ b/tests/transaction_test.go
@@ -28,8 +28,6 @@ import (
 )
 
 func TestTransaction(t *testing.T) {
-	//t.Parallel()
-
 	txt := new(testMatcher)
 
 	// We don't allow more than uint64 in gas amount
@@ -38,6 +36,7 @@ func TestTransaction(t *testing.T) {
 	txt.skipLoad("^ttGasLimit/TransactionWithGasLimitxPriceOverflow.json")
 
 	txt.walk(t, transactionTestDir, func(t *testing.T, name string, test *TransactionTest) {
+		t.Parallel()
 		cfg := params.MainnetChainConfig
 		if err := txt.checkFailure(t, test.Run(cfg.ChainID)); err != nil {
 			t.Error(err)