diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index ff2ea9c5..ebc802d1 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -1,48 +1,64 @@
 name: build
 
-on: [push, pull_request]
+on:
+  push:
+    branches:
+      - '*'
+  pull_request:
+    branches:
+      - '*'
+  workflow_dispatch:
+    workflow: '*'
+
+env:
+  MPLBACKEND: agg
 
 jobs:
   code:
     name: code style
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
+
       - uses: psf/black@stable
-      - uses: actions/setup-python@v2
+
+      - uses: actions/setup-python@v4
         with:
           python-version: 3.9
+
       - uses: isort/isort-action@master
         with:
           configuration: --profile black --filter-files --force-sort-within-sections --check-only --diff
 
       - name: Install Black with Jupyter extension
-        run: pip install black[jupyter]
+        run: |
+          pip install black[jupyter]
 
       - name: Check code style of Jupyter notebooks
-        run: black doc/**/*.ipynb --check
+        run: |
+          black doc/**/*.ipynb --check
 
   # Make sure all necessary files will be included in a release
   manifest:
     name: check manifest
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
 
-      - uses: actions/setup-python@v2
+      - uses: actions/setup-python@v4
 
       - name: Install dependencies
-        run: pip install manifix
+        run: |
+          pip install manifix
 
       - name: Check MANIFEST.in file
-        run: python setup.py manifix
+        run: |
+          python setup.py manifix
 
   build-with-pip:
     name: ${{ matrix.os }}-py${{ matrix.python-version }}${{ matrix.LABEL }}
     runs-on: ${{ matrix.os }}
     timeout-minutes: 15
-    env:
-      MPLBACKEND: agg
     strategy:
       fail-fast: false
       matrix:
@@ -55,26 +71,28 @@ jobs:
             DEPENDENCIES: diffpy.structure==3  matplotlib==3.3
             LABEL: -oldest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
 
       - name: Set up Python ${{ matrix.python-version }}
-        uses: actions/setup-python@v2
+        uses: actions/setup-python@v4
         with:
           python-version: ${{ matrix.python-version }}
 
-      - name: Display Python and pip versions
-        run: python -V; pip -V
-
       - name: Install depedencies and package
         shell: bash
-        run: pip install -U -e .'[doc, tests]'
+        run: |
+          pip install -U -e .'[doc, tests]'
 
       - name: Install oldest supported version
         if: ${{ matrix.OLDEST_SUPPORTED_VERSION }}
-        run: pip install ${{ matrix.DEPENDENCIES }}
+        run: |
+          pip install ${{ matrix.DEPENDENCIES }}
 
-      - name: Display package versions
-        run: pip list
+      - name: Display Python, pip and package versions
+        run: |
+          python -V
+          pip -V
+          pip list
 
       - name: Run docstring tests
         if: ${{ matrix.os == 'ubuntu-latest' }}
@@ -83,11 +101,13 @@ jobs:
           pytest --doctest-modules --ignore-glob=orix/tests orix/*.py
 
       - name: Run tests
-        run: pytest --cov=orix --pyargs orix
+        run: |
+          pytest -n 2 --cov=orix --pyargs orix
 
       - name: Generate line coverage
         if: ${{ matrix.os == 'ubuntu-latest' }}
-        run: coverage report --show-missing
+        run: |
+          coverage report --show-missing
 
       - name: Upload coverage to Coveralls
         if: ${{ matrix.os == 'ubuntu-latest' }}
diff --git a/orix/tests/conftest.py b/orix/tests/conftest.py
index a58b02fd..939d1f85 100644
--- a/orix/tests/conftest.py
+++ b/orix/tests/conftest.py
@@ -36,6 +36,11 @@ def rotations():
     return Rotation([(2, 4, 6, 8), (-1, -3, -5, -7)])
 
 
+@pytest.fixture()
+def eu():
+    return np.random.rand(10, 3)
+
+
 ANGFILE_TSL_HEADER = (
     "# TEM_PIXperUM          1.000000\n"
     "# x-star                0.413900\n"
diff --git a/setup.py b/setup.py
index 74bf73d6..f6dba090 100644
--- a/setup.py
+++ b/setup.py
@@ -30,6 +30,7 @@
         "numpydoc",
         "pytest                         >= 5.4",
         "pytest-cov                     >= 2.8.1",
+        "pytest-xdist",
     ],
 }
 extra_feature_requirements["dev"] = [