diff --git a/.github/workflows/host-tests.yml b/.github/workflows/host-tests.yml
index a151b32..27fce3c 100644
--- a/.github/workflows/host-tests.yml
+++ b/.github/workflows/host-tests.yml
@@ -31,8 +31,24 @@ jobs:
         run: bash scripts/test-host.sh
 
   ui-layout:
-    name: Native UI layout
-    runs-on: ubuntu-24.04
+    name: Native UI layout (${{ matrix.group }})
+    runs-on: blacksmith-8vcpu-ubuntu-2404
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - group: library
+            args: --screens-only library
+          - group: store
+            args: --screens-only store
+          - group: settings
+            args: --screens-only settings
+          - group: detail
+            args: --screens-only detail
+          - group: queue
+            args: --screens-only queue
+          - group: overlay and guest/empty
+            args: overlay
     steps:
       - name: Check out source
         uses: actions/checkout@11d5960a326750d5838078e36cf38b85af677262
@@ -47,16 +63,18 @@ jobs:
       - name: Build native UI layout test
         run: |
           cmake -S tests/ui_layout -B build/ui-layout -G Ninja -DCMAKE_BUILD_TYPE=Debug
-          cmake --build build/ui-layout -j4
+          cmake --build build/ui-layout -j"$(nproc)"
 
       - name: Check native UI layout
-        run: bash tests/ui_layout/run.sh build/ui-layout/ui_layout build/ui-evidence
+        env:
+          LP_NUM_THREADS: "1"
+        run: OPENNOW_UI_JOBS="$(nproc)" bash tests/ui_layout/run.sh build/ui-layout/ui_layout build/ui-evidence ${{ matrix.args }}
 
       - name: Upload native UI evidence
         if: always()
         uses: actions/upload-artifact@ea165f8d65b6e75b540449e92b4886f43607fa02
         with:
-          name: native-ui-evidence
+          name: native-ui-evidence-${{ strategy.job-index }}
           path: build/ui-evidence
           if-no-files-found: ignore
           retention-days: 7
diff --git a/tests/ui_layout/README.md b/tests/ui_layout/README.md
index 09185f8..8d3c7e5 100644
--- a/tests/ui_layout/README.md
+++ b/tests/ui_layout/README.md
@@ -44,6 +44,10 @@ For parallel isolated output directories, `--screens-only` before scenario names
 omits only separately assigned guest/empty cases. Run one group without that
 flag so all eight extra cases remain covered. Each attempted case gets a log;
 failures do not stop subsequent cases, and any failure makes the runner nonzero.
+Each case renders on Mesa's software rasterizer, so set `OPENNOW_UI_JOBS` to run
+that many cases at once on separate Xvfb displays. With `LP_NUM_THREADS=1`, one
+case per CPU gives the best throughput. CI splits the matrix into six groups and
+runs `OPENNOW_UI_JOBS=$(nproc)` on each 8-vCPU Blacksmith runner.
 
 ## Assertions
 
diff --git a/tests/ui_layout/run.sh b/tests/ui_layout/run.sh
index 3f11838..daf03c9 100644
--- a/tests/ui_layout/run.sh
+++ b/tests/ui_layout/run.sh
@@ -12,18 +12,21 @@ if [[ "${1:-}" == --screens-only ]]; then
     printf 'INFO Running named screens only; guest/empty cases run in the separate main matrix.\n'
 fi
 if (( $# )); then scenarios=("$@"); else scenarios=(library store settings detail queue overlay); fi
-status=0
+parallel_cases="${OPENNOW_UI_JOBS:-1}"
+case_number=0
+failures="$output/.failures"
+rm -f "$failures"
 capture_case() {
-    local language="$1" width="$2" account="$3" scenario="$4" name="$5"
+    local display="$1" language="$2" width="$3" account="$4" scenario="$5" name="$6"
     rm -f "$output/$name.ppm" "$output/$name.png" "$output/$name.ppm.queue.ppm" "$output/$name.ppm.queue.png" \
         "$output/$name.ppm.failure.ppm" "$output/$name.ppm.failure.png" "$output/$name.ppm.restored.ppm" "$output/$name.ppm.restored.png"
     rm -f "$output/$name.ppm".settings-*.ppm "$output/$name.ppm".settings-*.png
-    if xvfb-run -a -s '-screen 0 1920x1080x24' "$binary" "$language" "$account" \
+    if xvfb-run -n "$display" -s '-screen 0 1920x1080x24' "$binary" "$language" "$account" \
         "$output/$name.ppm" "$width" "$scenario" > "$output/$name.log" 2>&1; then
         printf 'PASS %s\n' "$name"
     else
         printf 'FAIL %s (see %s.log)\n' "$name" "$name"
-        status=1
+        printf '%s\n' "$name" >> "$failures"
     fi
     if [[ -f "$output/$name.ppm" ]]; then convert "$output/$name.ppm" "$output/$name.png"; fi
     if [[ -f "$output/$name.ppm.queue.ppm" ]]; then convert "$output/$name.ppm.queue.ppm" "$output/$name.ppm.queue.png"; fi
@@ -34,17 +37,23 @@ capture_case() {
     find "$output" -maxdepth 1 -name "$name.ppm.*-title-*.ppm" -print0 |
         while IFS= read -r -d '' path; do convert "$path" "${path%.ppm}.png"; done
 }
+schedule_case() {
+    while (( $(jobs -rp | wc -l) >= parallel_cases )); do wait -n || true; done
+    case_number=$((case_number + 1))
+    capture_case "$((100 + case_number))" "$@" &
+}
 for width in 1280 1920; do
     for language in en zh-CN es ru it fr pl uk; do
         for scenario in "${scenarios[@]}"; do
-            capture_case "$language" "$width" 'A player with a very long account display name' "$scenario" "$language-$width-$scenario"
+            schedule_case "$language" "$width" 'A player with a very long account display name' "$scenario" "$language-$width-$scenario"
         done
     done
     if (( include_extra )); then
-        capture_case en "$width" guest library "guest-$width"
-        capture_case en "$width" Player empty "empty-$width"
-        capture_case en "$width" guest store "guest-store-$width"
-        capture_case en "$width" Player empty-store "empty-store-$width"
+        schedule_case en "$width" guest library "guest-$width"
+        schedule_case en "$width" Player empty "empty-$width"
+        schedule_case en "$width" guest store "guest-store-$width"
+        schedule_case en "$width" Player empty-store "empty-store-$width"
     fi
 done
-exit "$status"
+wait
+if [[ -s "$failures" ]]; then exit 1; fi