diff --git a/src/cmd/compile/internal/gc/asm_test.go b/src/cmd/compile/internal/gc/asm_test.go
index b0635cd308..58cdb9da7d 100644
--- a/src/cmd/compile/internal/gc/asm_test.go
+++ b/src/cmd/compile/internal/gc/asm_test.go
@@ -21,6 +21,9 @@ import (
 // TestAssembly checks to make sure the assembly generated for
 // functions contains certain expected instructions.
 func TestAssembly(t *testing.T) {
+	if testing.Short() {
+		t.Skip("slow test; skipping")
+	}
 	testenv.MustHaveGoBuild(t)
 	if runtime.GOOS == "windows" {
 		// TODO: remove if we can get "go tool compile -S" to work on windows.
diff --git a/src/cmd/compile/internal/gc/ssa_test.go b/src/cmd/compile/internal/gc/ssa_test.go
index debdc4386b..1aebd90311 100644
--- a/src/cmd/compile/internal/gc/ssa_test.go
+++ b/src/cmd/compile/internal/gc/ssa_test.go
@@ -16,9 +16,11 @@ import (
 // TODO: move all these tests elsewhere?
 // Perhaps teach test/run.go how to run them with a new action verb.
 func runTest(t *testing.T, filename string) {
+	t.Parallel()
 	doTest(t, filename, "run")
 }
 func buildTest(t *testing.T, filename string) {
+	t.Parallel()
 	doTest(t, filename, "build")
 }
 func doTest(t *testing.T, filename string, kind string) {