diff --git a/.gitignore b/.gitignore
index 6f4c82ec..b0a9e7ef 100644
--- a/.gitignore
+++ b/.gitignore
@@ -8,7 +8,7 @@ Makefile.custom.config
 __pycache__
 uploads
 .cache
-.coverage
+.coverage*
 coverage.xml
 .env
 .mypy_cache
diff --git a/Makefile b/Makefile
index abaf07e1..d0ebf521 100644
--- a/Makefile
+++ b/Makefile
@@ -232,6 +232,8 @@ test-e2e-client:
 	E2E_ARGS=client $(PYTEST) e2e --driver firefox $(PYTEST_ARGS)
 
 test-python:
+	# for tests parallelization: 4 workers max.
+	# make test-python PYTEST_ARGS="-p no:warnings -n auto --maxprocesses=4"
 	$(PYTEST) fittrackee --cov-config .coveragerc --cov=fittrackee --cov-report term-missing $(PYTEST_ARGS)
 
 test-client:
diff --git a/db/create.sql b/db/create.sql
index f393a9f7..05c59d7e 100644
--- a/db/create.sql
+++ b/db/create.sql
@@ -1,5 +1,9 @@
 DROP DATABASE IF EXISTS fittrackee;
 DROP DATABASE IF EXISTS fittrackee_test;
+DROP DATABASE IF EXISTS fittrackee_test_gw0;
+DROP DATABASE IF EXISTS fittrackee_test_gw1;
+DROP DATABASE IF EXISTS fittrackee_test_gw2;
+DROP DATABASE IF EXISTS fittrackee_test_gw3;
 DROP SCHEMA IF EXISTS fittrackee;
 DROP USER IF EXISTS fittrackee;
 
@@ -7,3 +11,7 @@ CREATE USER fittrackee WITH PASSWORD 'fittrackee';
 CREATE SCHEMA fittrackee AUTHORIZATION fittrackee;
 CREATE DATABASE fittrackee OWNER fittrackee;
 CREATE DATABASE fittrackee_test OWNER fittrackee;
+CREATE DATABASE fittrackee_test_gw0 OWNER fittrackee;
+CREATE DATABASE fittrackee_test_gw1 OWNER fittrackee;
+CREATE DATABASE fittrackee_test_gw2 OWNER fittrackee;
+CREATE DATABASE fittrackee_test_gw3 OWNER fittrackee;
diff --git a/fittrackee/config.py b/fittrackee/config.py
index b398e32e..faac7e58 100644
--- a/fittrackee/config.py
+++ b/fittrackee/config.py
@@ -10,6 +10,12 @@ if os.getenv('APP_SETTINGS') == 'fittrackee.config.TestingConfig':
 else:
     broker = RedisBroker
 
+XDIST_WORKER = (
+    f"_{os.getenv('PYTEST_XDIST_WORKER')}"
+    if os.getenv('PYTEST_XDIST_WORKER')
+    else ''
+)
+
 
 class BaseConfig:
 
@@ -74,7 +80,13 @@ class DevelopmentConfig(BaseConfig):
 class TestingConfig(BaseConfig):
     DEBUG = True
     TESTING = True
-    SQLALCHEMY_DATABASE_URI = os.environ.get('DATABASE_TEST_URL')
+    SQLALCHEMY_DATABASE_URI = (
+        os.environ.get('DATABASE_TEST_URL', '') + XDIST_WORKER
+    )
+    UPLOAD_FOLDER = os.path.join(
+        os.getenv('UPLOAD_FOLDER', current_app.root_path),
+        'uploads' + XDIST_WORKER,
+    )
     SECRET_KEY = 'test key'  # nosec
     BCRYPT_LOG_ROUNDS = 4
     TOKEN_EXPIRATION_DAYS = 0
diff --git a/fittrackee/tests/application/test_config.py b/fittrackee/tests/application/test_config.py
index 7e43967d..375addac 100644
--- a/fittrackee/tests/application/test_config.py
+++ b/fittrackee/tests/application/test_config.py
@@ -41,7 +41,11 @@ class TestTestingConfig:
         app.config.from_object('fittrackee.config.TestingConfig')
 
         assert app.config['SQLALCHEMY_DATABASE_URI'] == os.environ.get(
-            'DATABASE_TEST_URL'
+            'DATABASE_TEST_URL', ''
+        ) + (
+            f"_{os.getenv('PYTEST_XDIST_WORKER')}"
+            if os.getenv('PYTEST_XDIST_WORKER')
+            else ''
         )
 
     def test_it_does_not_preserve_context_on_exception(
diff --git a/fittrackee/tests/conftest.py b/fittrackee/tests/conftest.py
index e8e959da..f0a40e34 100644
--- a/fittrackee/tests/conftest.py
+++ b/fittrackee/tests/conftest.py
@@ -8,6 +8,7 @@ os.environ['APP_SETTINGS'] = 'fittrackee.config.TestingConfig'
 # to avoid resetting dev database during tests
 os.environ['DATABASE_URL'] = os.environ['DATABASE_TEST_URL']
 TEMP_FOLDER = '/tmp/FitTrackee'
+os.makedirs(TEMP_FOLDER, exist_ok=True)
 os.environ['UPLOAD_FOLDER'] = TEMP_FOLDER
 os.environ['APP_LOG'] = TEMP_FOLDER + '/fittrackee.log'
 os.environ['AUTHLIB_INSECURE_TRANSPORT'] = '1'
diff --git a/fittrackee/tests/fixtures/fixtures_app.py b/fittrackee/tests/fixtures/fixtures_app.py
index af67a37e..ec093f8a 100644
--- a/fittrackee/tests/fixtures/fixtures_app.py
+++ b/fittrackee/tests/fixtures/fixtures_app.py
@@ -18,7 +18,11 @@ def get_app_config(
     max_users: Optional[int] = None,
 ) -> Optional[AppConfig]:
     if with_config:
-        config = AppConfig()
+        config = AppConfig.query.one_or_none()
+        if not config:
+            config = AppConfig()
+            db.session.add(config)
+            db.session.flush()
         config.gpx_limit_import = 10 if max_workouts is None else max_workouts
         config.max_single_file_size = (
             (1 if max_single_file_size is None else max_single_file_size)
@@ -31,7 +35,6 @@ def get_app_config(
             * 1024
         )
         config.max_users = 100 if max_users is None else max_users
-        db.session.add(config)
         db.session.commit()
         return config
     return None
diff --git a/fittrackee/tests/oauth2/test_oauth2_client.py b/fittrackee/tests/oauth2/test_oauth2_client.py
index 6b04b876..db86b46c 100644
--- a/fittrackee/tests/oauth2/test_oauth2_client.py
+++ b/fittrackee/tests/oauth2/test_oauth2_client.py
@@ -172,7 +172,7 @@ class TestCreateOAuth2Client:
 
 class TestOAuthCheckScopes:
     @pytest.mark.parametrize(
-        'input_scope', ['', 1, random_string(), [random_string(), 'readwrite']]
+        'input_scope', ['', 1, 'invalid_scope', ['invalid_scope', 'readwrite']]
     )
     def test_it_raises_error_when_scope_is_invalid(
         self, input_scope: Any
@@ -184,11 +184,11 @@ class TestOAuthCheckScopes:
         'input_scope,expected_scope',
         [
             ('profile:read', 'profile:read'),
-            ('profile:read ' + random_string(), 'profile:read'),
+            ('profile:read invalid_scope:read', 'profile:read'),
             ('profile:write', 'profile:write'),
             ('profile:read profile:write', 'profile:read profile:write'),
             (
-                'profile:write profile:read ' + random_string(),
+                'profile:write invalid_scope:read profile:read',
                 'profile:write profile:read',
             ),
         ],
diff --git a/fittrackee/tests/test_utils.py b/fittrackee/tests/test_utils.py
index 0b6f59fd..124a74ea 100644
--- a/fittrackee/tests/test_utils.py
+++ b/fittrackee/tests/test_utils.py
@@ -1,5 +1,4 @@
 from typing import Union
-from uuid import uuid4
 
 import pytest
 
@@ -34,7 +33,7 @@ class TestReadableDuration:
             ('en', '30 seconds'),
             ('fr', '30 secondes'),
             (None, '30 seconds'),
-            (uuid4().hex, '30 seconds'),
+            ('invalid_locale', '30 seconds'),
         ],
     )
     def test_it_returns_duration_in_locale(
diff --git a/poetry.lock b/poetry.lock
index f26d39f8..60425004 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -280,6 +280,17 @@ python-versions = ">=3.7"
 [package.extras]
 test = ["pytest (>=6)"]
 
+[[package]]
+name = "execnet"
+version = "1.9.0"
+description = "execnet: rapid multi-Python deployment"
+category = "dev"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
+
+[package.extras]
+testing = ["pre-commit"]
+
 [[package]]
 name = "flake8"
 version = "3.9.2"
@@ -745,6 +756,17 @@ python-versions = ">=3.6"
 [package.extras]
 twisted = ["twisted"]
 
+[[package]]
+name = "psutil"
+version = "5.9.4"
+description = "Cross-platform lib for process and system monitoring in Python."
+category = "dev"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+
+[package.extras]
+test = ["enum34", "ipaddress", "mock", "pywin32", "wmi"]
+
 [[package]]
 name = "psycopg2-binary"
 version = "2.9.5"
@@ -1002,6 +1024,24 @@ hjson = ["hjson"]
 toml = ["toml"]
 yaml = ["PyYAML"]
 
+[[package]]
+name = "pytest-xdist"
+version = "3.0.2"
+description = "pytest xdist plugin for distributed testing and loop-on-failing modes"
+category = "dev"
+optional = false
+python-versions = ">=3.6"
+
+[package.dependencies]
+execnet = ">=1.1"
+psutil = {version = ">=3.0", optional = true, markers = "extra == \"psutil\""}
+pytest = ">=6.2.0"
+
+[package.extras]
+psutil = ["psutil (>=3.0)"]
+setproctitle = ["setproctitle"]
+testing = ["filelock"]
+
 [[package]]
 name = "python-dateutil"
 version = "2.8.2"
@@ -1577,7 +1617,7 @@ testing = ["flake8 (<5)", "func-timeout", "jaraco.functools", "jaraco.itertools"
 [metadata]
 lock-version = "1.1"
 python-versions = "^3.7"
-content-hash = "b8ef9801e4dcd04375d3a5e83303ddc8a1b65ad35a127e1e2fd115e85cbe095c"
+content-hash = "ae84573fe28fd08fc1a7917d20ca97f73e070a668cf0baa0ac546d3a6f7e58ae"
 
 [metadata.files]
 alabaster = [
@@ -1840,6 +1880,10 @@ exceptiongroup = [
     {file = "exceptiongroup-1.0.1-py3-none-any.whl", hash = "sha256:4d6c0aa6dd825810941c792f53d7b8d71da26f5e5f84f20f9508e8f2d33b140a"},
     {file = "exceptiongroup-1.0.1.tar.gz", hash = "sha256:73866f7f842ede6cb1daa42c4af078e2035e5f7607f0e2c762cc51bb31bbe7b2"},
 ]
+execnet = [
+    {file = "execnet-1.9.0-py2.py3-none-any.whl", hash = "sha256:a295f7cc774947aac58dde7fdc85f4aa00c42adf5d8f5468fc630c1acf30a142"},
+    {file = "execnet-1.9.0.tar.gz", hash = "sha256:8f694f3ba9cc92cab508b152dcfe322153975c29bda272e2fd7f3f00f36e47c5"},
+]
 flake8 = [
     {file = "flake8-3.9.2-py2.py3-none-any.whl", hash = "sha256:bf8fd333346d844f616e8d47905ef3a3384edae6b4e9beb0c5101e25e3110907"},
     {file = "flake8-3.9.2.tar.gz", hash = "sha256:07528381786f2a6237b061f6e96610a4167b226cb926e2aa2b6b1d78057c576b"},
@@ -2165,6 +2209,22 @@ prometheus-client = [
     {file = "prometheus_client-0.15.0-py3-none-any.whl", hash = "sha256:db7c05cbd13a0f79975592d112320f2605a325969b270a94b71dcabc47b931d2"},
     {file = "prometheus_client-0.15.0.tar.gz", hash = "sha256:be26aa452490cfcf6da953f9436e95a9f2b4d578ca80094b4458930e5f584ab1"},
 ]
+psutil = [
+    {file = "psutil-5.9.4-cp27-cp27m-macosx_10_9_x86_64.whl", hash = "sha256:c1ca331af862803a42677c120aff8a814a804e09832f166f226bfd22b56feee8"},
+    {file = "psutil-5.9.4-cp27-cp27m-manylinux2010_i686.whl", hash = "sha256:68908971daf802203f3d37e78d3f8831b6d1014864d7a85937941bb35f09aefe"},
+    {file = "psutil-5.9.4-cp27-cp27m-manylinux2010_x86_64.whl", hash = "sha256:3ff89f9b835100a825b14c2808a106b6fdcc4b15483141482a12c725e7f78549"},
+    {file = "psutil-5.9.4-cp27-cp27m-win32.whl", hash = "sha256:852dd5d9f8a47169fe62fd4a971aa07859476c2ba22c2254d4a1baa4e10b95ad"},
+    {file = "psutil-5.9.4-cp27-cp27m-win_amd64.whl", hash = "sha256:9120cd39dca5c5e1c54b59a41d205023d436799b1c8c4d3ff71af18535728e94"},
+    {file = "psutil-5.9.4-cp27-cp27mu-manylinux2010_i686.whl", hash = "sha256:6b92c532979bafc2df23ddc785ed116fced1f492ad90a6830cf24f4d1ea27d24"},
+    {file = "psutil-5.9.4-cp27-cp27mu-manylinux2010_x86_64.whl", hash = "sha256:efeae04f9516907be44904cc7ce08defb6b665128992a56957abc9b61dca94b7"},
+    {file = "psutil-5.9.4-cp36-abi3-macosx_10_9_x86_64.whl", hash = "sha256:54d5b184728298f2ca8567bf83c422b706200bcbbfafdc06718264f9393cfeb7"},
+    {file = "psutil-5.9.4-cp36-abi3-manylinux_2_12_i686.manylinux2010_i686.manylinux_2_17_i686.manylinux2014_i686.whl", hash = "sha256:16653106f3b59386ffe10e0bad3bb6299e169d5327d3f187614b1cb8f24cf2e1"},
+    {file = "psutil-5.9.4-cp36-abi3-manylinux_2_12_x86_64.manylinux2010_x86_64.manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:54c0d3d8e0078b7666984e11b12b88af2db11d11249a8ac8920dd5ef68a66e08"},
+    {file = "psutil-5.9.4-cp36-abi3-win32.whl", hash = "sha256:149555f59a69b33f056ba1c4eb22bb7bf24332ce631c44a319cec09f876aaeff"},
+    {file = "psutil-5.9.4-cp36-abi3-win_amd64.whl", hash = "sha256:fd8522436a6ada7b4aad6638662966de0d61d241cb821239b2ae7013d41a43d4"},
+    {file = "psutil-5.9.4-cp38-abi3-macosx_11_0_arm64.whl", hash = "sha256:6001c809253a29599bc0dfd5179d9f8a5779f9dffea1da0f13c53ee568115e1e"},
+    {file = "psutil-5.9.4.tar.gz", hash = "sha256:3d7f9739eb435d4b1338944abe23f49584bde5395f27487d2ee25ad9a8774a62"},
+]
 psycopg2-binary = [
     {file = "psycopg2-binary-2.9.5.tar.gz", hash = "sha256:33e632d0885b95a8b97165899006c40e9ecdc634a529dca7b991eb7de4ece41c"},
     {file = "psycopg2_binary-2.9.5-cp310-cp310-macosx_10_15_x86_64.macosx_10_9_intel.macosx_10_9_x86_64.macosx_10_10_intel.macosx_10_10_x86_64.whl", hash = "sha256:0775d6252ccb22b15da3b5d7adbbf8cfe284916b14b6dc0ff503a23edb01ee85"},
@@ -2315,6 +2375,10 @@ pytest-variables = [
     {file = "pytest-variables-2.0.0.tar.gz", hash = "sha256:1c9e4fc321e33be7d1b352ac9cf20fdd2c39a8e4e6fa2dcd042aaf70ed516be7"},
     {file = "pytest_variables-2.0.0-py3-none-any.whl", hash = "sha256:1a24a30b7acf9654d71bcdc8b10c1eb0d81b73b3eec72d810703c522475d643b"},
 ]
+pytest-xdist = [
+    {file = "pytest-xdist-3.0.2.tar.gz", hash = "sha256:688da9b814370e891ba5de650c9327d1a9d861721a524eb917e620eec3e90291"},
+    {file = "pytest_xdist-3.0.2-py3-none-any.whl", hash = "sha256:9feb9a18e1790696ea23e1434fa73b325ed4998b0e9fcb221f16fd1945e6df1b"},
+]
 python-dateutil = [
     {file = "python-dateutil-2.8.2.tar.gz", hash = "sha256:0123cacc1627ae19ddf3c27a5de5bd67ee4586fbdd6440d9748f8abb483d3e86"},
     {file = "python_dateutil-2.8.2-py2.py3-none-any.whl", hash = "sha256:961d03dc3453ebbc59dbdea9e4e11c5651520a876d0f4db161e8674aae935da9"},
diff --git a/pyproject.toml b/pyproject.toml
index aaab3791..ead174ce 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -59,6 +59,7 @@ pytest-flake8 = "^1.1"
 pytest-isort = "^3.1"
 pytest-runner = "^6.0"
 pytest-selenium = "^2.0.1"
+pytest-xdist = {extras = ["psutil"], version = "^3.0.2"}
 recommonmark = "^0.7"
 sphinx = "^5.1"
 sphinx-bootstrap-theme = "^0.8.1"