diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index dbcc4f4d..9a4c5d9d 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -17,6 +17,11 @@ concurrency:
 
 jobs:
   test-windows:
+    strategy:
+      fail-fast: false
+      matrix:
+        pytest-split-group: [1, 2, 3, 4, 5]
+        pytest-split-groups: [5]
     env:
       PYTHONUNBUFFERED: "1"
       FORCE_COLOR: "1"
@@ -34,7 +39,7 @@ jobs:
       - name: Install dev deps
         run: |
           conda activate test
-          mamba install pip pytest-cov pytest-xdist
+          mamba install pip pytest-cov pytest-xdist pytest-split
           python -m pip install -r requirements-dev.txt
 
       - name: install conda-lock
@@ -50,7 +55,7 @@ jobs:
           pushd "${RUNNER_TEMP}"
           set TMPDIR="%RUNNER_TEMP%"
           dir
-          pytest --cov=conda_lock --cov-branch --cov-report=xml --cov-report=term tests
+          pytest --cov=conda_lock --cov-branch --cov-report=xml --cov-report=term --splits ${{ matrix.pytest-split-groups }} --group ${{ matrix.pytest-split-group }} tests
           copy coverage.xml %GITHUB_WORKSPACE%
       - uses: codecov/codecov-action@v3
 
@@ -61,6 +66,18 @@ jobs:
       matrix:
         os: [ ubuntu-latest, macos-latest ]
         python-version: [ "3.8", "3.11" ]
+        pytest-split-group: [1, 2, 3]
+        pytest-split-groups: [2, 3]
+        exclude:
+          - os: ubuntu-latest
+            # Force pytest-split-groups to 2 by excluding 3
+            pytest-split-groups: 3
+          - os: macos-latest
+            # Force pytest-split-groups to 3 by excluding 2
+            pytest-split-groups: 2
+          - os: ubuntu-latest
+            # Don't run the third group on ubuntu
+            pytest-split-group: 3
     defaults:
       run:
         shell: bash -l {0}
@@ -81,7 +98,7 @@ jobs:
       - name: Install dev deps
         run: |
           conda activate test
-          mamba install pip pytest-cov pytest-xdist
+          mamba install pip pytest-cov pytest-xdist pytest-split
           set -x
           echo "${PATH}"
           which pip
@@ -106,7 +123,7 @@ jobs:
           ls -lah
           set -x
           which pytest
-          pytest --cov=conda_lock --cov-branch --cov-report=xml --cov-report=term tests
+          pytest --cov=conda_lock --cov-branch --cov-report=xml --cov-report=term --splits ${{ matrix.pytest-split-group }} --group ${{ matrix.pytest-split-group }} tests
           cp coverage.xml "${GITHUB_WORKSPACE}"
       - uses: codecov/codecov-action@v3
 
diff --git a/.test_durations b/.test_durations
new file mode 100644
index 00000000..0db659db
--- /dev/null
+++ b/.test_durations
@@ -0,0 +1,120 @@
+{
+    "conda_lock/models/test_channel.py::test__detect_used_env_var": 0.0044590262696146965,
+    "conda_lock/models/test_channel.py::test_url_auth_info": 0.01338486629538238,
+    "tests/test_conda_lock.py::test__add_auth_to_line[# pip mypackage @ https://pypi.mychannel.cloud/simple-auth4-# pip mypackage @ https://username1:password1@pypi.mychannel.cloud/simple]": 0.0027642359491437674,
+    "tests/test_conda_lock.py::test__add_auth_to_line[# pip mypackage @ https://pypi.otherchannel.cloud/simple-auth5-# pip mypackage @ https://pypi.otherchannel.cloud/simple]": 0.0021687184926122427,
+    "tests/test_conda_lock.py::test__add_auth_to_line[https://conda.mychannel.cloud/channel1/mypackage-auth2-https://username:password@conda.mychannel.cloud/channel1/mypackage]": 0.0022148219868540764,
+    "tests/test_conda_lock.py::test__add_auth_to_line[https://conda.mychannel.cloud/channel1/mypackage-auth3-https://username1:password1@conda.mychannel.cloud/channel1/mypackage]": 0.0020119459368288517,
+    "tests/test_conda_lock.py::test__add_auth_to_line[https://conda.mychannel.cloud/mypackage-auth0-https://username:password@conda.mychannel.cloud/mypackage]": 0.0020599619019776583,
+    "tests/test_conda_lock.py::test__add_auth_to_line[https://conda.mychannel.cloud/mypackage-auth1-https://conda.mychannel.cloud/mypackage]": 0.0018740820232778788,
+    "tests/test_conda_lock.py::test__add_auth_to_lockfile[# The following domains require authentication:\\n# - a.mychannel.cloud\\n# - c.mychannel.cloud\\n# - d.mychannel.cloud\\nhttp://a.mychannel.cloud/mypackage\\nhttp://b.mychannel.cloud/mypackage\\nhttp://c.mychannel.cloud/mypackage\\n# pip mypackage @ http://d.mychannel.cloud/mypackage\\n-# The following domains require authentication:\\n# - a.mychannel.cloud\\n# - c.mychannel.cloud\\n# - d.mychannel.cloud\\nhttp://username_a:password_a@a.mychannel.cloud/mypackage\\nhttp://b.mychannel.cloud/mypackage\\nhttp://username_c:password_c@c.mychannel.cloud/mypackage\\n# pip mypackage @ http://username_d:password_d@d.mychannel.cloud/mypackage\\n]": 0.0021428640466183424,
+    "tests/test_conda_lock.py::test__extract_domain[# pip mypackage @ https://pypi.mychannel.cloud/simple-pypi.mychannel.cloud]": 0.004476058064028621,
+    "tests/test_conda_lock.py::test__extract_domain[http://conda.mychannel.cloud/mypackage-conda.mychannel.cloud]": 0.00953778624534607,
+    "tests/test_conda_lock.py::test__extract_domain[https://conda.mychannel.cloud/mypackage-conda.mychannel.cloud]": 0.01166083524003625,
+    "tests/test_conda_lock.py::test__strip_auth_from_line[# pip mypackage @ https://pypi.mychannel.cloud/simple-# pip mypackage @ https://pypi.mychannel.cloud/simple]": 0.004538550041615963,
+    "tests/test_conda_lock.py::test__strip_auth_from_line[# pip mypackage @ https://username1:password1@pypi.mychannel.cloud/simple-# pip mypackage @ https://pypi.mychannel.cloud/simple]": 0.004323852248489857,
+    "tests/test_conda_lock.py::test__strip_auth_from_line[http://conda.mychannel.cloud/mypackage-http://conda.mychannel.cloud/mypackage]": 0.0055056612472981215,
+    "tests/test_conda_lock.py::test__strip_auth_from_line[http://user:password@conda.mychannel.cloud/mypackage-http://conda.mychannel.cloud/mypackage]": 0.005796841811388731,
+    "tests/test_conda_lock.py::test__strip_auth_from_line[https://conda.mychannel.cloud/mypackage-https://conda.mychannel.cloud/mypackage]": 0.015453723957762122,
+    "tests/test_conda_lock.py::test__strip_auth_from_line[https://user:password@conda.mychannel.cloud/mypackage-https://conda.mychannel.cloud/mypackage]": 0.013227654155343771,
+    "tests/test_conda_lock.py::test__strip_auth_from_lockfile[http://a.mychannel.cloud/mypackage\\nhttp://b.mychannel.cloud/mypackage\\nhttp://c.mychannel.cloud/mypackage\\n# pip mypackage @ http://d.mychannel.cloud/mypackage\\n-http://a.mychannel.cloud/mypackage\\nhttp://b.mychannel.cloud/mypackage\\nhttp://c.mychannel.cloud/mypackage\\n# pip mypackage @ http://d.mychannel.cloud/mypackage\\n]": 0.0017164601013064384,
+    "tests/test_conda_lock.py::test__strip_auth_from_lockfile[http://user:password@a.mychannel.cloud/mypackage\\nhttp://b.mychannel.cloud/mypackage\\nhttp://user:password@c.mychannel.cloud/mypackage\\n# pip mypackage @ http://user:password@d.mychannel.cloud/mypackage\\n-# The following domains require authentication:\\n# - a.mychannel.cloud\\n# - c.mychannel.cloud\\n# - d.mychannel.cloud\\nhttp://a.mychannel.cloud/mypackage\\nhttp://b.mychannel.cloud/mypackage\\nhttp://c.mychannel.cloud/mypackage\\n# pip mypackage @ http://d.mychannel.cloud/mypackage\\n]": 0.0019474257715046406,
+    "tests/test_conda_lock.py::test_aggregate_lock_specs": 1.2763855010271072,
+    "tests/test_conda_lock.py::test_aggregate_lock_specs_invalid_channels": 0.03590670810081065,
+    "tests/test_conda_lock.py::test_aggregate_lock_specs_multiple_platforms": 0.006713381968438625,
+    "tests/test_conda_lock.py::test_aggregate_lock_specs_override_version": 1.6720386389642954,
+    "tests/test_conda_lock.py::test_choose_wheel": 7.891909349011257,
+    "tests/test_conda_lock.py::test_cli_version": 1.0643445942550898,
+    "tests/test_conda_lock.py::test_default_virtual_package_input_hash_stability": 0.005248077679425478,
+    "tests/test_conda_lock.py::test_extract_json_object": 0.0016865991055965424,
+    "tests/test_conda_lock.py::test_fake_conda_env[conda]": 2.4932802789844573,
+    "tests/test_conda_lock.py::test_fake_conda_env[mamba]": 3.1682756498921663,
+    "tests/test_conda_lock.py::test_fake_conda_env[micromamba]": 1.2988834620919079,
+    "tests/test_conda_lock.py::test_install[conda-env]": 140.27129216119647,
+    "tests/test_conda_lock.py::test_install[conda-explicit]": 19.50872055394575,
+    "tests/test_conda_lock.py::test_install[mamba-env]": 19.579558146651834,
+    "tests/test_conda_lock.py::test_install[mamba-explicit]": 9.53389447904192,
+    "tests/test_conda_lock.py::test_install[micromamba-env]": 6.250606240937486,
+    "tests/test_conda_lock.py::test_install[micromamba-explicit]": 9.245201598852873,
+    "tests/test_conda_lock.py::test_lock_poetry_ibis": 42.33643715083599,
+    "tests/test_conda_lock.py::test_parse_env_file_with_filters_defaults": 0.017547639086842537,
+    "tests/test_conda_lock.py::test_parse_env_file_with_filters_no_args": 0.013967463746666908,
+    "tests/test_conda_lock.py::test_parse_environment_file": 0.017137509072199464,
+    "tests/test_conda_lock.py::test_parse_environment_file_with_pip": 0.014858064008876681,
+    "tests/test_conda_lock.py::test_parse_flit": 0.006220192881301045,
+    "tests/test_conda_lock.py::test_parse_meta_yaml_file": 0.06765178288333118,
+    "tests/test_conda_lock.py::test_parse_pdm": 7.360471409978345,
+    "tests/test_conda_lock.py::test_parse_pip_requirement[package-thingie1[foo]-parsed0]": 0.002158720977604389,
+    "tests/test_conda_lock.py::test_parse_pip_requirement[package[extra] = 2.1-parsed2]": 0.0019457850139588118,
+    "tests/test_conda_lock.py::test_parse_pip_requirement[package[extra] == 2.1-parsed3]": 0.0023466390557587147,
+    "tests/test_conda_lock.py::test_parse_pip_requirement[package[extra] >=0.8.0-alpha.2,<1.0.0.0-parsed6]": 0.005290928995236754,
+    "tests/test_conda_lock.py::test_parse_pip_requirement[package[extra] >=2.1.*, <4.0-parsed5]": 0.0069599400740116835,
+    "tests/test_conda_lock.py::test_parse_pip_requirement[package[extra] @ https://foo.bar/package.whl#sha1=blerp-parsed1]": 0.0019281471613794565,
+    "tests/test_conda_lock.py::test_parse_pip_requirement[package[extra]===2.1-parsed4]": 0.0021447089966386557,
+    "tests/test_conda_lock.py::test_parse_poetry": 6.9989939029328525,
+    "tests/test_conda_lock.py::test_parse_poetry_no_pypi": 0.0075933379121124744,
+    "tests/test_conda_lock.py::test_poetry_version_parsing_constraints[python->=3.6,<3.7-/python-3.6]": 8.781420079059899,
+    "tests/test_conda_lock.py::test_poetry_version_parsing_constraints[python-^2.7-/python-2.7]": 32.686923403060064,
+    "tests/test_conda_lock.py::test_poetry_version_parsing_constraints[python-~3.6-/python-3.6]": 7.1190555829089135,
+    "tests/test_conda_lock.py::test_prepare_repositories_pool": 0.01316592376679182,
+    "tests/test_conda_lock.py::test_private_lock[conda-$QUETZ_API_KEY]": 167.53543734387495,
+    "tests/test_conda_lock.py::test_private_lock[conda-${QUETZ_API_KEY}]": 14.05618537706323,
+    "tests/test_conda_lock.py::test_private_lock[mamba-$QUETZ_API_KEY]": 29.20311124715954,
+    "tests/test_conda_lock.py::test_private_lock[mamba-${QUETZ_API_KEY}]": 10.083066730760038,
+    "tests/test_conda_lock.py::test_private_lock[micromamba-$QUETZ_API_KEY]": 7.757304751081392,
+    "tests/test_conda_lock.py::test_private_lock[micromamba-${QUETZ_API_KEY}]": 0.04886101931333542,
+    "tests/test_conda_lock.py::test_run_lock[conda]": 83.847992134979,
+    "tests/test_conda_lock.py::test_run_lock[mamba]": 43.905100357951596,
+    "tests/test_conda_lock.py::test_run_lock[micromamba]": 44.00821655779146,
+    "tests/test_conda_lock.py::test_run_lock_blas_mkl[conda]": 27.50570274796337,
+    "tests/test_conda_lock.py::test_run_lock_blas_mkl[mamba]": 7.7282587920781225,
+    "tests/test_conda_lock.py::test_run_lock_blas_mkl[micromamba]": 6.085412611020729,
+    "tests/test_conda_lock.py::test_run_lock_regression_gh155[conda]": 12.19158754707314,
+    "tests/test_conda_lock.py::test_run_lock_regression_gh155[mamba]": 9.053441614843905,
+    "tests/test_conda_lock.py::test_run_lock_regression_gh155[micromamba]": 4.326663556043059,
+    "tests/test_conda_lock.py::test_run_lock_relative_source_path[conda]": 2.4107686991337687,
+    "tests/test_conda_lock.py::test_run_lock_relative_source_path[mamba]": 2.4218363990075886,
+    "tests/test_conda_lock.py::test_run_lock_relative_source_path[micromamba]": 2.246905382955447,
+    "tests/test_conda_lock.py::test_run_lock_uppercase_pip[conda]": 12.315469726920128,
+    "tests/test_conda_lock.py::test_run_lock_uppercase_pip[mamba]": 7.507358531001955,
+    "tests/test_conda_lock.py::test_run_lock_uppercase_pip[micromamba]": 3.7060587687883526,
+    "tests/test_conda_lock.py::test_run_lock_with_custom_metadata[conda]": 16.25292714405805,
+    "tests/test_conda_lock.py::test_run_lock_with_custom_metadata[mamba]": 76.81640638317913,
+    "tests/test_conda_lock.py::test_run_lock_with_custom_metadata[micromamba]": 3.5591639990452677,
+    "tests/test_conda_lock.py::test_run_lock_with_git_metadata[conda]": 16.833537717116997,
+    "tests/test_conda_lock.py::test_run_lock_with_git_metadata[mamba]": 7.034437482943758,
+    "tests/test_conda_lock.py::test_run_lock_with_git_metadata[micromamba]": 3.538599671330303,
+    "tests/test_conda_lock.py::test_run_lock_with_input_hash_check[conda]": 34.062637554015964,
+    "tests/test_conda_lock.py::test_run_lock_with_input_hash_check[mamba]": 2.547731716185808,
+    "tests/test_conda_lock.py::test_run_lock_with_input_hash_check[micromamba]": 2.074163547018543,
+    "tests/test_conda_lock.py::test_run_lock_with_input_metadata[conda]": 19.766404184978455,
+    "tests/test_conda_lock.py::test_run_lock_with_input_metadata[mamba]": 6.900205792160705,
+    "tests/test_conda_lock.py::test_run_lock_with_input_metadata[micromamba]": 51.49917463120073,
+    "tests/test_conda_lock.py::test_run_lock_with_local_package[conda]": 0.011794581077992916,
+    "tests/test_conda_lock.py::test_run_lock_with_local_package[mamba]": 0.02334260498173535,
+    "tests/test_conda_lock.py::test_run_lock_with_local_package[micromamba]": 0.012574640102684498,
+    "tests/test_conda_lock.py::test_run_lock_with_locked_environment_files[conda]": 2.585544525878504,
+    "tests/test_conda_lock.py::test_run_lock_with_locked_environment_files[mamba]": 2.785396486055106,
+    "tests/test_conda_lock.py::test_run_lock_with_locked_environment_files[micromamba]": 15.509860154706985,
+    "tests/test_conda_lock.py::test_run_lock_with_pip[conda]": 352.00825743796304,
+    "tests/test_conda_lock.py::test_run_lock_with_pip[mamba]": 7.3949902430176735,
+    "tests/test_conda_lock.py::test_run_lock_with_pip[micromamba]": 21.479689084924757,
+    "tests/test_conda_lock.py::test_run_lock_with_pip_environment_different_names_same_deps[conda]": 14.562333019217476,
+    "tests/test_conda_lock.py::test_run_lock_with_pip_environment_different_names_same_deps[mamba]": 15.594794017029926,
+    "tests/test_conda_lock.py::test_run_lock_with_pip_environment_different_names_same_deps[micromamba]": 54.5677305161953,
+    "tests/test_conda_lock.py::test_run_lock_with_time_metadata[conda]": 16.39776355284266,
+    "tests/test_conda_lock.py::test_run_lock_with_time_metadata[mamba]": 5.529624433722347,
+    "tests/test_conda_lock.py::test_run_lock_with_time_metadata[micromamba]": 2.918327509891242,
+    "tests/test_conda_lock.py::test_run_lock_with_update[conda]": 155.17123162886128,
+    "tests/test_conda_lock.py::test_run_lock_with_update[mamba]": 9.115055882139131,
+    "tests/test_conda_lock.py::test_run_lock_with_update[micromamba]": 43.55620776605792,
+    "tests/test_conda_lock.py::test_run_with_channel_inversion": 114.43516132631339,
+    "tests/test_conda_lock.py::test_spec_poetry": 0.00874163187108934,
+    "tests/test_conda_lock.py::test_virtual_package_input_hash_stability": 0.004808719968423247,
+    "tests/test_conda_lock.py::test_virtual_packages[conda-env]": 40.06911605782807,
+    "tests/test_conda_lock.py::test_virtual_packages[conda-explicit]": 166.67617870983668,
+    "tests/test_conda_lock.py::test_virtual_packages[mamba-env]": 9.238974520936608,
+    "tests/test_conda_lock.py::test_virtual_packages[mamba-explicit]": 3.896394713083282,
+    "tests/test_conda_lock.py::test_virtual_packages[micromamba-env]": 8.28422360913828,
+    "tests/test_conda_lock.py::test_virtual_packages[micromamba-explicit]": 8.922804991714656
+}
\ No newline at end of file