diff --git a/.github/workflows/regression.yml b/.github/workflows/regression.yml
index 9e242a72..4b4eee75 100644
--- a/.github/workflows/regression.yml
+++ b/.github/workflows/regression.yml
@@ -41,7 +41,7 @@ jobs:
         CMR_PASS: ${{ secrets.CMR_PASS }}
         ENV:  ${{ matrix.environment }}
       run: |
-        poetry run pytest verify_collection.py --env ${{ matrix.environment }} --regression --junitxml=$GITHUB_WORKSPACE/test-results/${{ matrix.environment }}_test_report.xml || true
+        poetry run pytest -n 4 verify_collection.py --env ${{ matrix.environment }} --regression --junitxml=$GITHUB_WORKSPACE/test-results/${{ matrix.environment }}_test_report.xml || true
         poetry run python get_associations.py
 
     - name: Run Create Issues Script
diff --git a/poetry.lock b/poetry.lock
index 6793e408..7125bbae 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -596,6 +596,20 @@ files = [
 [package.extras]
 test = ["pytest (>=6)"]
 
+[[package]]
+name = "execnet"
+version = "2.1.1"
+description = "execnet: rapid multi-Python deployment"
+optional = false
+python-versions = ">=3.8"
+files = [
+    {file = "execnet-2.1.1-py3-none-any.whl", hash = "sha256:26dee51f1b80cebd6d0ca8e74dd8745419761d3bef34163928cbebbdc4749fdc"},
+    {file = "execnet-2.1.1.tar.gz", hash = "sha256:5189b52c6121c24feae288166ab41b32549c7e2348652736540b9e6e7d4e72e3"},
+]
+
+[package.extras]
+testing = ["hatch", "pre-commit", "pytest", "tox"]
+
 [[package]]
 name = "fiona"
 version = "1.9.6"
@@ -1887,6 +1901,26 @@ files = [
 [package.dependencies]
 pytest = ">=7.0.0"
 
+[[package]]
+name = "pytest-xdist"
+version = "3.6.1"
+description = "pytest xdist plugin for distributed testing, most importantly across multiple CPUs"
+optional = false
+python-versions = ">=3.8"
+files = [
+    {file = "pytest_xdist-3.6.1-py3-none-any.whl", hash = "sha256:9ed4adfb68a016610848639bb7e02c9352d5d9f03d04809919e2dafc3be4cca7"},
+    {file = "pytest_xdist-3.6.1.tar.gz", hash = "sha256:ead156a4db231eec769737f57668ef58a2084a34b2e55c4a8fa20d861107300d"},
+]
+
+[package.dependencies]
+execnet = ">=2.1"
+pytest = ">=7.0.0"
+
+[package.extras]
+psutil = ["psutil (>=3.0)"]
+setproctitle = ["setproctitle"]
+testing = ["filelock"]
+
 [[package]]
 name = "python-cmr"
 version = "0.11.0"
@@ -2136,6 +2170,21 @@ files = [
     {file = "tblib-3.0.0.tar.gz", hash = "sha256:93622790a0a29e04f0346458face1e144dc4d32f493714c6c3dff82a4adb77e6"},
 ]
 
+[[package]]
+name = "tenacity"
+version = "8.3.0"
+description = "Retry code until it succeeds"
+optional = false
+python-versions = ">=3.8"
+files = [
+    {file = "tenacity-8.3.0-py3-none-any.whl", hash = "sha256:3649f6443dbc0d9b01b9d8020a9c4ec7a1ff5f6f3c6c8a036ef371f573fe9185"},
+    {file = "tenacity-8.3.0.tar.gz", hash = "sha256:953d4e6ad24357bceffbc9707bc74349aca9d245f68eb65419cf0c249a1949a2"},
+]
+
+[package.extras]
+doc = ["reno", "sphinx"]
+test = ["pytest", "tornado (>=4.5)", "typeguard"]
+
 [[package]]
 name = "tomli"
 version = "2.0.1"
@@ -2361,4 +2410,4 @@ test = ["big-O", "importlib-resources", "jaraco.functools", "jaraco.itertools",
 [metadata]
 lock-version = "2.0"
 python-versions = "^3.10"
-content-hash = "318cc1bc7d978ab67942c603a634fad0938f1bda7544e16da4a0310ade34b22a"
+content-hash = "9d68481c070800d43b52b60ee7f9b424575a57c57d052e1f6dea3a55d26acc61"
diff --git a/pyproject.toml b/pyproject.toml
index b9fd2ddb..3177d112 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -17,6 +17,8 @@ xarray = "^2024.5.0"
 cf-xarray = "^0.9.1"
 l2ss-py = "^2.4.0"
 pygithub = "^2.2.0"
+pytest-xdist = "^3.6.1"
+tenacity = "^8.3.0"
 
 [tool.poetry.group.dev.dependencies]
 pytest = "^8.2.1"
diff --git a/tests/verify_collection.py b/tests/verify_collection.py
index ced2057a..b9fe3c59 100644
--- a/tests/verify_collection.py
+++ b/tests/verify_collection.py
@@ -16,6 +16,7 @@
 import xarray
 
 from requests.auth import HTTPBasicAuth
+from tenacity import retry, wait_fixed, stop_after_attempt, wait_exponential
 
 import cmr
 
@@ -183,15 +184,18 @@ def verify_groups(merged_group, origin_group, subset_index, file=None, both_merg
         verify_groups(merged_subgroup, origin_subgroup, subset_index, both_merged=both_merged)
 
 
-def download_file(url, local_path, headers):
-    response = requests.get(url, stream=True, headers=headers)
-    if response.status_code == 200:
-        with open(local_path, 'wb') as file:
-            for chunk in response.iter_content(chunk_size=8192):
-                file.write(chunk)
-        logging.info("Original File downloaded successfully. " + local_path)
-    else:
-        logging.info(f"Failed to download the file. Status code: {response.status_code}")
+@retry(wait=wait_exponential(multiplier=1.5, min=3, max=60), stop=stop_after_attempt(10))
+def download_file(url, local_path, headers=None):
+    try:
+        with requests.get(url, stream=True, headers=headers) as response:
+            response.raise_for_status()  # Check if the request was successful
+            with open(local_path, 'wb') as file:
+                for chunk in response.iter_content(chunk_size=8192):
+                    if chunk:  # Filter out keep-alive new chunks
+                        file.write(chunk)
+        logging.info(f"File downloaded successfully: {local_path}")
+    except requests.RequestException as e:
+        logging.error(f"Failed to download the file. Exception: {e}")
 
 
 @pytest.mark.timeout(600)