diff --git a/tests/fixtures/environment/environment_fixtures.py b/tests/fixtures/environment/environment_fixtures.py
index 91b185a35..2679e3ca3 100644
--- a/tests/fixtures/environment/environment_fixtures.py
+++ b/tests/fixtures/environment/environment_fixtures.py
@@ -99,7 +99,7 @@ def example_euroc_env(example_date_naive):
     return euroc_env
 
 
-@pytest.fixture
+@pytest.fixture(scope="session")
 def env_analysis():
     """Environment Analysis class with hardcoded parameters
 
diff --git a/tests/integration/environment/test_environment_analysis.py b/tests/integration/environment/test_environment_analysis.py
index 2b12a2057..6e3a76aef 100644
--- a/tests/integration/environment/test_environment_analysis.py
+++ b/tests/integration/environment/test_environment_analysis.py
@@ -3,14 +3,12 @@
 from unittest.mock import patch
 
 import matplotlib as plt
-import pytest
 
 from rocketpy import Environment
 
 plt.rcParams.update({"figure.max_open_warning": 0})
 
 
-@pytest.mark.slow
 @patch("matplotlib.pyplot.show")
 def test_all_info(mock_show, env_analysis):  # pylint: disable=unused-argument
     """Test the EnvironmentAnalysis.all_info() method, which already invokes
@@ -32,7 +30,6 @@ def test_all_info(mock_show, env_analysis):  # pylint: disable=unused-argument
     os.remove("wind_rose.gif")  # remove the files created by the method
 
 
-@pytest.mark.slow
 @patch("matplotlib.pyplot.show")
 def test_exports(mock_show, env_analysis):  # pylint: disable=unused-argument
     """Check the export methods of the EnvironmentAnalysis class. It
@@ -59,7 +56,6 @@ def test_exports(mock_show, env_analysis):  # pylint: disable=unused-argument
     os.remove("export_env_analysis.json")
 
 
-@pytest.mark.slow
 @patch("matplotlib.pyplot.show")
 def test_create_environment_object(mock_show, env_analysis):  # pylint: disable=unused-argument
     assert isinstance(env_analysis.create_environment_object(), Environment)
diff --git a/tests/unit/environment/test_environment_analysis.py b/tests/unit/environment/test_environment_analysis.py
index a9f9a945e..dda5df31b 100644
--- a/tests/unit/environment/test_environment_analysis.py
+++ b/tests/unit/environment/test_environment_analysis.py
@@ -48,7 +48,6 @@ def test_missing_timezonefinder_defaults_to_utc(
     assert analysis.end_date.tzinfo is not None
 
 
-@pytest.mark.slow
 @patch("matplotlib.pyplot.show")
 def test_distribution_plots(mock_show, env_analysis):  # pylint: disable=unused-argument
     """Tests the distribution plots method of the EnvironmentAnalysis class. It
@@ -79,7 +78,6 @@ def test_distribution_plots(mock_show, env_analysis):  # pylint: disable=unused-
     )
 
 
-@pytest.mark.slow
 @patch("matplotlib.pyplot.show")
 def test_average_plots(mock_show, env_analysis):  # pylint: disable=unused-argument
     """Tests the average plots method of the EnvironmentAnalysis class. It
@@ -105,7 +103,6 @@ def test_average_plots(mock_show, env_analysis):  # pylint: disable=unused-argum
     assert env_analysis.plots.average_wind_rose_specific_hour(12) is None
 
 
-@pytest.mark.slow
 @patch("matplotlib.pyplot.show")
 def test_profile_plots(mock_show, env_analysis):  # pylint: disable=unused-argument
     """Check the profile plots method of the EnvironmentAnalysis class. It
@@ -147,7 +144,6 @@ def test_profile_plots(mock_show, env_analysis):  # pylint: disable=unused-argum
     )
 
 
-@pytest.mark.slow
 def test_values(env_analysis):
     """Check the numeric properties of the EnvironmentAnalysis class. It computes
     a few values and compares them to the expected values. Not all the values are
@@ -171,7 +167,6 @@ def test_values(env_analysis):
     assert pytest.approx(env_analysis.std_pressure_at_30000ft, 1e-6) == 38.48947
 
 
-@pytest.mark.slow
 @patch("matplotlib.pyplot.show")
 def test_animation_plots(mock_show, env_analysis):  # pylint: disable=unused-argument
     """Check the animation plots method of the EnvironmentAnalysis class. It
@@ -202,7 +197,6 @@ def test_animation_plots(mock_show, env_analysis):  # pylint: disable=unused-arg
     os.remove("wind_rose.gif")  # remove the files created by the method
 
 
-@pytest.mark.slow
 def test_pressure_level_wind_profile_uses_velocity_components(env_analysis):
     """Regression for PR #1041: the redundant per-level ``wind_heading`` and
     ``wind_direction`` functions were removed from the pressure-level data.