diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 9b020f0cb7..621c291319 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -40,6 +40,7 @@ jobs:
       - name: Install Poetry
         uses: snok/install-poetry@v1
         with:
+          version: 1.8.5
           virtualenvs-create: true
           virtualenvs-in-project: true
           virtualenvs-path: .venv
@@ -165,6 +166,7 @@ jobs:
       - name: Install Poetry
         uses: snok/install-poetry@v1
         with:
+          version: 1.8.5
           virtualenvs-create: true
           virtualenvs-in-project: true
           virtualenvs-path: .venv
diff --git a/docs/developing-locust.rst b/docs/developing-locust.rst
index dcd553cb5c..59c26faca4 100644
--- a/docs/developing-locust.rst
+++ b/docs/developing-locust.rst
@@ -16,7 +16,7 @@ Fork Locust on `GitHub <https://github.com/locustio/locust/>`_ and then
     # clone the repo:
     $ git clone git://github.com/<YourName>/locust.git
 
-    # install the poetry build system, see https://python-poetry.org/docs/#installation
+    # install the poetry build system, version 1.8.5, see https://python-poetry.org/docs/#installation
 
     # install the required poetry plugins:
     $ poetry self add "poethepoet[poetry_plugin]"
diff --git a/locust/test/__init__.py b/locust/test/__init__.py
index f572fea02c..b8fc66aef5 100644
--- a/locust/test/__init__.py
+++ b/locust/test/__init__.py
@@ -13,3 +13,10 @@
     changed_rlimit = True
 except Exception:
     changed_rlimit = False
+
+import os
+
+# Clean environment from stuff you might have lying around
+os.environ.pop("LOCUST_WEB_LOGIN", None)
+# Ensure locust-cloud is not loaded during tests
+os.environ.pop("PGHOST", None)
diff --git a/locust/test/test_main.py b/locust/test/test_main.py
index 4ed88b8e2b..63d71f7c63 100644
--- a/locust/test/test_main.py
+++ b/locust/test/test_main.py
@@ -613,7 +613,6 @@ def test_autostart_wo_run_time(self):
                 response = requests.get(f"http://localhost:{port}/")
             except Exception:
                 pass
-            self.assertEqual(200, response.status_code)
             proc.send_signal(signal.SIGTERM)
             stdout, stderr = proc.communicate()
             self.assertIn("Starting Locust", stderr)
@@ -621,6 +620,7 @@ def test_autostart_wo_run_time(self):
             self.assertIn("Shutting down ", stderr)
             self.assertNotIn("Traceback", stderr)
             # check response afterwards, because it really isn't as informative as stderr
+            self.assertEqual(200, response.status_code)
             d = pq(response.content.decode("utf-8"))
 
             self.assertEqual(200, response.status_code)
@@ -885,7 +885,7 @@ def t(self):
                         mocked.file_path,
                         "--headless",
                         "--run-time",
-                        "7s",
+                        "6s",
                         "-u",
                         "0",
                         "--loglevel",
@@ -999,7 +999,7 @@ def test_spawing_with_fixed_multiple_locustfiles(self):
                             f"{mocked1.file_path},{mocked2.file_path}",
                             "--headless",
                             "--run-time",
-                            "5s",
+                            "2s",
                             "-u",
                             "10",
                             "-r",
@@ -1053,7 +1053,7 @@ def t(self):
                     mocked.file_path,
                     "--headless",
                     "--run-time",
-                    "1s",
+                    "0.5",
                     "-u",
                     "3",
                 ],
@@ -1674,8 +1674,10 @@ def t(self):
                     "1",
                     "-u",
                     "3",
+                    "-r",
+                    "99",
                     "-t",
-                    "5s",
+                    "1s",
                 ],
                 stderr=STDOUT,
                 stdout=PIPE,
@@ -1737,8 +1739,10 @@ def t(self):
                     "1",
                     "-u",
                     "3",
+                    "-r",
+                    "99",
                     "-t",
-                    "5s",
+                    "1s",
                 ],
                 stderr=STDOUT,
                 stdout=PIPE,
@@ -1759,7 +1763,7 @@ def t(self):
             proc_worker.communicate()
 
             self.assertIn(
-                'Spawning is complete and report waittime is expired, but not all reports received from workers: {"User1": 2} (2 total users)',
+                "Spawning is complete and report waittime is expired, but not all reports received from workers:",
                 stdout,
             )
             self.assertIn("Shutting down (exit code 0)", stdout)
@@ -1808,7 +1812,7 @@ def t(self):
                 stdout=PIPE,
                 text=True,
             )
-            gevent.sleep(2)
+            gevent.sleep(1)
             proc_worker2 = subprocess.Popen(
                 [
                     "locust",
@@ -1858,7 +1862,7 @@ def t(self):
                 stdout=PIPE,
                 text=True,
             )
-            gevent.sleep(2)
+            gevent.sleep(1)
             proc = subprocess.Popen(
                 [
                     "locust",
@@ -1916,7 +1920,6 @@ def t(self):
                 stdout=PIPE,
                 text=True,
             )
-            gevent.sleep(2)
             proc_worker = subprocess.Popen(
                 [
                     "locust",
@@ -1998,6 +2001,7 @@ def hello_world(self):
             self.assertEqual(dict, type(result["num_reqs_per_sec"]))
             self.assertEqual(dict, type(result["num_fail_per_sec"]))
 
+    @unittest.skipIf(True, reason="This test is too slow for the value it provides")
     def test_worker_indexes(self):
         content = """
 from locust import HttpUser, task, between