diff --git a/.github/workflows/cython.yml b/.github/workflows/cython.yml
index 2d4523a..5c7313e 100644
--- a/.github/workflows/cython.yml
+++ b/.github/workflows/cython.yml
@@ -82,5 +82,7 @@ jobs:
         run: |
           cd cy
           python -m pip install -U pip "setuptools<60" wheel
+          #precompile _testmultiphase
+          python -c "import _testmultiphase"
           # python setup.py build_ext -i  # pypy should be faster with pure python
-          python runtests.py -vv --no-code-style -x Debugger -x pyximport --backends=${{ matrix.backend }} -j7 -x error_pos
+          python runtests.py -vv --no-code-style -x Debugger -x pyximport --backends=${{ matrix.backend }} -j5