diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index b6fb5cb8..51536858 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -26,8 +26,6 @@ jobs:
     permissions:
       contents: read
       security-events: write
-    env:
-      TOXENV: ${{ matrix.name }}
     steps:
       - uses: actions/checkout@v4
         with:
@@ -56,7 +54,9 @@ jobs:
           uv tool install tox==4.28.4 --with tox-uv
 
       - name: Run tox
-        run: tox
+        run: tox ${TOX_ARGS}
+        env:
+          TOX_ARGS: ${{ matrix.use_factor && format('-f {0}', matrix.name) || format('-e {0}', matrix.name) }}
 
       - name: Upload zizmor SARIF report into the GitHub repo code scanning
         if: contains(matrix.name, 'linting')
@@ -77,79 +77,68 @@ jobs:
       fail-fast: false
       matrix:
         include:
-        - name: linting,docs
-          python: '3.13'
-          allow_failure: false
-
-        # Explicitly test min pytest.
-        - name: py313-dj52-sqlite-pytestmin-coverage
-          python: '3.13'
-          allow_failure: false
-
-        - name: py313-dj52-postgres-xdist-coverage
-          python: '3.13'
-          allow_failure: false
-
-        - name: py313-dj51-postgres-xdist-coverage
-          python: '3.13'
-          allow_failure: false
-
-        - name: py312-dj42-postgres-xdist-coverage
-          python: '3.12'
-          allow_failure: false
-
-        - name: py311-dj50-postgres-xdist-coverage
-          python: '3.11'
-          allow_failure: false
-
-        - name: py311-dj42-postgres-xdist-coverage
-          python: '3.11'
-          allow_failure: false
-
-        - name: py310-dj52-postgres-xdist-coverage
-          python: '3.10'
-          allow_failure: false
-
-        - name: py310-dj51-postgres-xdist-coverage
-          python: '3.10'
-          allow_failure: false
-
-        - name: py310-dj42-postgres-xdist-coverage
-          python: '3.10'
-          allow_failure: false
-
-        - name: py311-dj51-mysql-coverage
-          python: '3.11'
-          allow_failure: false
-
-        - name: py310-dj42-mysql-coverage
-          python: '3.10'
-          allow_failure: false
-
-        - name: py39-dj42-mysql-xdist-coverage
-          python: '3.9'
-          allow_failure: false
-
-        - name: py313-djmain-sqlite-coverage
-          python: '3.13'
-          allow_failure: true
-
-        - name: py313-dj52-sqlite-coverage
-          python: '3.13'
-          allow_failure: true
-
-        - name: py312-dj51-sqlite-xdist-coverage
-          python: '3.12'
-          allow_failure: false
-
-        - name: py311-dj42-sqlite-xdist-coverage
-          python: '3.11'
-          allow_failure: false
-
-        # pypy3: not included with coverage reports (much slower then).
-        - name: pypy3-dj42-postgres
-          python: 'pypy3.9'
-          allow_failure: false
+          - name: linting,docs
+            python: '3.13'
+            allow_failure: false
+            use_factor: false
+
+          - name: py39-sqlite-xdist-coverage
+            python: '3.9'
+            allow_failure: false
+            use_factor: true
+
+          - name: py310-sqlite-xdist-coverage
+            python: '3.10'
+            allow_failure: false
+            use_factor: true
+
+          - name: py311-sqlite-xdist-coverage
+            python: '3.11'
+            allow_failure: false
+            use_factor: true
+
+          # start: Speeding up tests by running them in parallel.
+          - name: py312-dj42-sqlite-xdist-coverage
+            python: '3.12'
+            allow_failure: false
+            use_factor: false
+
+          - name: py312-dj51-sqlite-xdist-coverage
+            python: '3.12'
+            allow_failure: false
+            use_factor: false
+
+          - name: py312-dj52-sqlite-xdist-coverage
+            python: '3.12'
+            allow_failure: false
+            use_factor: false
+          # end: Speeding up tests by running them in parallel.
+
+          - name: py313-sqlite-xdist-coverage
+            python: '3.13'
+            allow_failure: false
+            use_factor: true
+
+          - name: py313-djmain-postgres-coverage
+            python: '3.13'
+            allow_failure: false
+            use_factor: false
+
+          - name: py313-djmain-mysql-coverage
+            python: '3.13'
+            allow_failure: false
+            use_factor: false
+
+          - name: py313-djmain-sqlite-pytestmin
+            python: '3.13'
+            allow_failure: false
+            use_factor: false
+
+          # pypy3: not included with coverage reports (much slower then).
+          - name: pypy3-dj52-sqlite
+            python: 'pypy3.11'
+            allow_failure: false
+            use_factor: false
 
   check:  # This job does nothing and is only used for the branch protection
     if: always()
diff --git a/pyproject.toml b/pyproject.toml
index 75915cc8..56c1ff11 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -122,6 +122,9 @@ include = [
     "pytest_django_test/*",
     "tests/*",
 ]
+omit = [
+    "pytest_django/_version.py",  # coverage fails when the file stops existing randomly, see .gitignore
+]
 skip_covered = true
 exclude_lines = [
     "pragma: no cover",
diff --git a/tox.ini b/tox.ini
index 5ffeeead..a9b99641 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,10 +1,10 @@
 [tox]
 envlist =
-    py313-dj{main,52,51}-postgres
-    py312-dj{main,52,51,42}-postgres
-    py311-dj{main,52,51,42}-postgres
-    py310-dj{main,52,51,42}-postgres
-    py39-dj42-postgres
+    py313-dj{main,52,51}-{sqlite,postgres,mysql}-{xdist}-{coverage}
+    py312-dj{main,52,51,42}-{sqlite,postgres,mysql}-{xdist}-{coverage}
+    py{py,}311-dj{52,51,42}-{sqlite,postgres,mysql}-{xdist}-{coverage}
+    py{py,}310-dj{52,51,42}-{sqlite,postgres,mysql}-{xdist}-{coverage}
+    py{py,}39-dj42-{sqlite,postgres,mysql}-{xdist}-{coverage}
     linting
 
 [testenv]
@@ -16,17 +16,19 @@ dependency_groups =
     xdist: xdist
 deps =
     djmain: https://github.com/django/django/archive/main.tar.gz
-    dj52: Django>=5.2a1,<6.0
+    dj52: Django>=5.2,<6.0
     dj51: Django>=5.1,<5.2
     dj50: Django>=5.0,<5.1
     dj42: Django>=4.2,<4.3
+
     pytestmin: pytest>=7.0,<7.1
 
 setenv =
-    mysql: DJANGO_SETTINGS_MODULE=pytest_django_test.settings_mysql
+    mysql:        DJANGO_SETTINGS_MODULE=pytest_django_test.settings_mysql
     postgres:     DJANGO_SETTINGS_MODULE=pytest_django_test.settings_postgres
     sqlite:       DJANGO_SETTINGS_MODULE=pytest_django_test.settings_sqlite
     sqlite_file:  DJANGO_SETTINGS_MODULE=pytest_django_test.settings_sqlite_file
+    xdist:        PYTEST_ADDOPTS=-n auto
 
     coverage: PYTESTDJANGO_TEST_RUNNER=coverage run -m pytest
     coverage: COVERAGE_PROCESS_START={toxinidir}/pyproject.toml