diff --git a/data_for_test.py b/data_for_test.py
index bde2cd974fb711349107e23ebf51e308b3c05316..13232d3d7148d4efb2b8c05585e0ba882618e1de 100644
--- a/data_for_test.py
+++ b/data_for_test.py
@@ -926,11 +926,11 @@ single_data["Case d:z"] = FluxDataSingle(
 
 
 @pytest.fixture(scope="session", params=[
-    "Case flat:x", "Case flat:y", "Case flat:z",
-    "Case a:x", "Case a:y", "Case a:z",
-    "Case b:x", "Case b:y", "Case b:z",
-    "Case c:x", "Case c:y", "Case c:z",
-    "Case d:x", "Case d:y", "Case d:z"])
+    #"Case flat:x", "Case flat:y", "Case flat:z",
+    "Case a:x"])#, "Case a:y", "Case a:z",
+    #"Case b:x", "Case b:y", "Case b:z",
+    #"Case c:x", "Case c:y", "Case c:z",
+    #"Case d:x", "Case d:y", "Case d:z"])
 def flux_test_data_fixture(request):
     return single_data[request.param]
 
diff --git a/test.py b/test.py
index ed0a4360ff2e3963dd1c1f4913f49ce72fbe08b6..5e465eaf657f2b14b965702d79957181094d66e3 100644
--- a/test.py
+++ b/test.py
@@ -18,6 +18,7 @@ import utilities as u
 from data_for_test import flux_test_data_fixture  # noqa: F401
 
 
+@pytest.mark.slow
 def test_weno_flux_uniform_grid(ctx_factory, flux_test_data_fixture):
     data = flux_test_data_fixture
 
@@ -37,6 +38,7 @@ def test_weno_flux_uniform_grid(ctx_factory, flux_test_data_fixture):
     u.compare_arrays(flux_dev.get(), data.weno_flux)
 
 
+@pytest.mark.slow
 def test_consistent_part_uniform_grid(ctx_factory, flux_test_data_fixture):
     data = flux_test_data_fixture
 
@@ -52,6 +54,7 @@ def test_consistent_part_uniform_grid(ctx_factory, flux_test_data_fixture):
     u.compare_arrays(consistent_dev.get(), data.consistent)
 
 
+@pytest.mark.slow
 def test_dissipation_part_pos_uniform_grid(ctx_factory, flux_test_data_fixture):
     data = flux_test_data_fixture
 
@@ -69,6 +72,7 @@ def test_dissipation_part_pos_uniform_grid(ctx_factory, flux_test_data_fixture):
     u.compare_arrays(dissipation_dev.get(), data.dissipation_pos)
 
 
+@pytest.mark.slow
 def test_dissipation_part_neg_uniform_grid(ctx_factory, flux_test_data_fixture):
     data = flux_test_data_fixture
 
@@ -86,6 +90,7 @@ def test_dissipation_part_neg_uniform_grid(ctx_factory, flux_test_data_fixture):
     u.compare_arrays(dissipation_dev.get(), data.dissipation_neg)
 
 
+@pytest.mark.slow
 def test_weno_weights_pos_uniform_grid(ctx_factory, flux_test_data_fixture):
     data = flux_test_data_fixture
 
@@ -105,6 +110,7 @@ def test_weno_weights_pos_uniform_grid(ctx_factory, flux_test_data_fixture):
     u.compare_arrays(weights_dev.get(), data.weno_weights_pos)
 
 
+@pytest.mark.slow
 def test_weno_weights_neg_uniform_grid(ctx_factory, flux_test_data_fixture):
     data = flux_test_data_fixture
 
@@ -124,6 +130,7 @@ def test_weno_weights_neg_uniform_grid(ctx_factory, flux_test_data_fixture):
     u.compare_arrays(weights_dev.get(), data.weno_weights_neg)
 
 
+@pytest.mark.slow
 def test_oscillation_pos_uniform_grid(ctx_factory, flux_test_data_fixture):
     data = flux_test_data_fixture
 
@@ -139,6 +146,7 @@ def test_oscillation_pos_uniform_grid(ctx_factory, flux_test_data_fixture):
     u.compare_arrays(oscillation_dev.get(), data.oscillation_pos)
 
 
+@pytest.mark.slow
 def test_oscillation_neg_uniform_grid(ctx_factory, flux_test_data_fixture):
     data = flux_test_data_fixture
 
@@ -154,6 +162,7 @@ def test_oscillation_neg_uniform_grid(ctx_factory, flux_test_data_fixture):
     u.compare_arrays(oscillation_dev.get(), data.oscillation_neg)
 
 
+@pytest.mark.slow
 def test_flux_splitting_uniform_grid(ctx_factory, flux_test_data_fixture):
     data = flux_test_data_fixture
 
@@ -175,6 +184,7 @@ def test_flux_splitting_uniform_grid(ctx_factory, flux_test_data_fixture):
     u.compare_arrays(fluxes_neg_dev.get(), data.char_fluxes_neg)
 
 
+@pytest.mark.slow
 def test_pointwise_eigenvalues_ideal_gas(ctx_factory, flux_test_data_fixture):
     data = flux_test_data_fixture
 
@@ -189,6 +199,7 @@ def test_pointwise_eigenvalues_ideal_gas(ctx_factory, flux_test_data_fixture):
     u.compare_arrays(lam_dev.get(), data.lam_pointwise)
 
 
+@pytest.mark.slow
 def test_roe_uniform_grid_ideal_gas(ctx_factory, flux_test_data_fixture):
     data = flux_test_data_fixture
 
@@ -228,6 +239,7 @@ def test_roe_uniform_grid_ideal_gas(ctx_factory, flux_test_data_fixture):
     check_roe_property(data.state_pair, data.flux_pair, R, R_inv, lam)
 
 
+@pytest.mark.slow
 @pytest.mark.parametrize("lam_pointwise_str,lam_roe_str,lam_expected_str", [
     ("1 2 3 4 5,2 4 6 8 10", "1.5 3 4.5 6 7.5", "2.2 4.4 6.6 8.8 11"),
     ("1 2 3 4 5,-2 -4 -6 -8 -10", "1.5 3 4.5 6 7.5", "2.2 4.4 6.6 8.8 11"),
@@ -253,6 +265,7 @@ def test_lax_wavespeeds(
     u.compare_arrays(lam_dev.get(), lam_expected)
 
 
+@pytest.mark.slow
 def test_matvec(ctx_factory):
     prg = u.get_weno_program_with_root_kernel("mult_mat_vec")
     queue = u.get_queue(ctx_factory)