diff --git a/run_regression.sh b/run_regression.sh
index ac9e3cc..843210d 100644
--- a/run_regression.sh
+++ b/run_regression.sh
@@ -1,9 +1,14 @@
 #!/bin/bash
 # Frozen regression runner: detached, logged, with an explicit end marker, so an ssh
 # drop cannot kill it (2026-09-21: a foreground pytest over ssh died with the connection).
+#
+# -n 14 via pytest-xdist: single-process pytest on the server is SLOWER than the laptop
+# (5:49 against 3:42), so the server only pays with parallelism.  BLAS threads MUST be
+# pinned to 1, or every xdist worker grabs 3+ cores (2026-09-16: 50+ minutes, load 55/16).
+export OMP_NUM_THREADS=1 OPENBLAS_NUM_THREADS=1 MKL_NUM_THREADS=1
 cd "$HOME/sim-numerics" || exit 1
 for pass in 1 2; do
     echo "=== PASS $pass ==="
-    ~/torchenv/bin/python -m pytest tests -q -p no:cacheprovider 2>&1 | tail -4
+    ~/torchenv/bin/python -m pytest tests -q -p no:cacheprovider -n 14 2>&1 | tail -4
 done
 echo "=== REGRESSION DONE ==="