diff --git a/.github/workflows/test-all-packages.yml b/.github/workflows/test-all-packages.yml
index f88455570dc..330c9332ab2 100644
--- a/.github/workflows/test-all-packages.yml
+++ b/.github/workflows/test-all-packages.yml
@@ -164,9 +164,6 @@ jobs:
       - name: yarn test (ERTP)
         if: (success() || failure())
         run: cd packages/ERTP && yarn ${{ steps.vars.outputs.test }} | $TEST_COLLECT
-      - name: yarn test (governance)
-        if: (success() || failure())
-        run: cd packages/governance && yarn ${{ steps.vars.outputs.test }} | $TEST_COLLECT
       - name: yarn test (import-manager)
         if: (success() || failure())
         run: cd packages/import-manager && yarn ${{ steps.vars.outputs.test }} | $TEST_COLLECT
@@ -197,6 +194,12 @@ jobs:
       - name: yarn test (vow)
         if: (success() || failure())
         run: cd packages/vow && yarn ${{ steps.vars.outputs.test }} | $TEST_COLLECT
+      - name: yarn test (xsnap-lockdown)
+        if: (success() || failure())
+        run: cd packages/xsnap-lockdown && yarn ${{ steps.vars.outputs.test }} | $TEST_COLLECT
+      - name: yarn test (xsnap)
+        if: (success() || failure())
+        run: cd packages/xsnap && yarn ${{ steps.vars.outputs.test }} | $TEST_COLLECT
       - name: notify on failure
         if: failure() && github.event_name != 'pull_request'
         uses: ./.github/actions/notify-status
@@ -334,14 +337,14 @@ jobs:
 
   ##############
   # Long-running tests are executed individually.
-  test-solo:
+  test-governance:
     # BEGIN-TEST-BOILERPLATE
     timeout-minutes: 30
     needs: build
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        # test:xs is noop in solo/package.json
+        # test:xs is noop in governance/package.json
         engine: ['18.x', '20.x']
     steps:
       - name: set vars
@@ -356,9 +359,9 @@ jobs:
         with:
           node-version: ${{ steps.vars.outputs.node-version }}
       # END-TEST-BOILERPLATE
-      - name: yarn test (solo)
+      - name: yarn test (governance)
         if: (success() || failure())
-        run: cd packages/solo && yarn ${{ steps.vars.outputs.test }} | $TEST_COLLECT
+        run: cd packages/governance && yarn ${{ steps.vars.outputs.test }} | $TEST_COLLECT
       - name: notify on failure
         if: failure() && github.event_name != 'pull_request'
         uses: ./.github/actions/notify-status
@@ -375,15 +378,15 @@ jobs:
           datadog-token: ${{ secrets.DATADOG_API_KEY }}
           codecov-token: ${{ secrets.CODECOV_TOKEN }}
 
-  test-cosmic-swingset:
+  test-solo:
     # BEGIN-TEST-BOILERPLATE
     timeout-minutes: 30
     needs: build
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        # test:xs is noop in cosmic-swingset/package.json
-        engine: ['18.x', '20.x', 'xs']
+        # test:xs is noop in solo/package.json
+        engine: ['18.x', '20.x']
     steps:
       - name: set vars
         id: vars
@@ -397,12 +400,9 @@ jobs:
         with:
           node-version: ${{ steps.vars.outputs.node-version }}
       # END-TEST-BOILERPLATE
-      - uses: ./.github/actions/restore-golang
-        with:
-          go-version: '1.20'
-      - name: yarn test (cosmic-swingset)
+      - name: yarn test (solo)
         if: (success() || failure())
-        run: cd packages/cosmic-swingset && yarn ${{ steps.vars.outputs.test }} | $TEST_COLLECT
+        run: cd packages/solo && yarn ${{ steps.vars.outputs.test }} | $TEST_COLLECT
       - name: notify on failure
         if: failure() && github.event_name != 'pull_request'
         uses: ./.github/actions/notify-status
@@ -419,15 +419,15 @@ jobs:
           datadog-token: ${{ secrets.DATADOG_API_KEY }}
           codecov-token: ${{ secrets.CODECOV_TOKEN }}
 
-  test-inter-protocol:
+  test-cosmic-swingset:
     # BEGIN-TEST-BOILERPLATE
     timeout-minutes: 30
     needs: build
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        # test:xs is noop in inter-protocol/package.json
-        engine: ['18.x', '20.x']
+        # test:xs is noop in cosmic-swingset/package.json
+        engine: ['18.x', '20.x', 'xs']
     steps:
       - name: set vars
         id: vars
@@ -441,9 +441,12 @@ jobs:
         with:
           node-version: ${{ steps.vars.outputs.node-version }}
       # END-TEST-BOILERPLATE
-      - name: yarn test (inter-protocol)
+      - uses: ./.github/actions/restore-golang
+        with:
+          go-version: '1.20'
+      - name: yarn test (cosmic-swingset)
         if: (success() || failure())
-        run: cd packages/inter-protocol && yarn ${{ steps.vars.outputs.test }} | $TEST_COLLECT
+        run: cd packages/cosmic-swingset && yarn ${{ steps.vars.outputs.test }} | $TEST_COLLECT
       - name: notify on failure
         if: failure() && github.event_name != 'pull_request'
         uses: ./.github/actions/notify-status
@@ -460,14 +463,15 @@ jobs:
           datadog-token: ${{ secrets.DATADOG_API_KEY }}
           codecov-token: ${{ secrets.CODECOV_TOKEN }}
 
-  test-boot:
+  test-inter-protocol:
     # BEGIN-TEST-BOILERPLATE
-    timeout-minutes: 40
+    timeout-minutes: 30
     needs: build
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        engine: ['18.x', '20.x', 'xs']
+        # test:xs is noop in inter-protocol/package.json
+        engine: ['18.x', '20.x']
     steps:
       - name: set vars
         id: vars
@@ -481,9 +485,9 @@ jobs:
         with:
           node-version: ${{ steps.vars.outputs.node-version }}
       # END-TEST-BOILERPLATE
-      - name: yarn test (boot)
+      - name: yarn test (inter-protocol)
         if: (success() || failure())
-        run: cd packages/boot && yarn ${{ steps.vars.outputs.test }} | $TEST_COLLECT
+        run: cd packages/inter-protocol && yarn ${{ steps.vars.outputs.test }} | $TEST_COLLECT
       - name: notify on failure
         if: failure() && github.event_name != 'pull_request'
         uses: ./.github/actions/notify-status
@@ -500,15 +504,17 @@ jobs:
           datadog-token: ${{ secrets.DATADOG_API_KEY }}
           codecov-token: ${{ secrets.CODECOV_TOKEN }}
 
-  # The test-swingset* tests are split by alphabetical test name.
-  test-swingset:
+  test-boot:
     # BEGIN-TEST-BOILERPLATE
-    timeout-minutes: 30
+    timeout-minutes: 40
     needs: build
     runs-on: ubuntu-latest
     strategy:
       matrix:
         engine: ['18.x', '20.x', 'xs']
+        # Run parallel testing jobs, each executing a subset.
+        node_index: [0, 1, 2, 3]
+        total_nodes: [4] # the total number of nodes
     steps:
       - name: set vars
         id: vars
@@ -516,17 +522,17 @@ jobs:
           echo "node-version=${{ matrix.engine == 'xs' && '18.x' || matrix.engine }}" >> $GITHUB_OUTPUT
           echo "test=${{ matrix.engine == 'xs' && 'test:xs' || 'test' }}" >> $GITHUB_OUTPUT
           echo "GH_ENGINE=${{ matrix.engine }}" >> $GITHUB_ENV
+          echo "CI_NODE_INDEX=${{ matrix.node_index }}" >> $GITHUB_ENV
+          echo "CI_NODE_TOTAL=${{ matrix.total_nodes }}" >> $GITHUB_ENV
 
       - uses: actions/checkout@v4
       - uses: ./.github/actions/restore-node
         with:
           node-version: ${{ steps.vars.outputs.node-version }}
-        id: restore-node
-      - run: echo "ENDO_BRANCH=${{ steps.restore-node.outputs.endo-branch }}" >> $GITHUB_ENV
       # END-TEST-BOILERPLATE
-      - name: yarn test (SwingSet)
+      - name: yarn test (boot)
         if: (success() || failure())
-        run: cd packages/SwingSet && yarn ${{ steps.vars.outputs.test }} 'test/**/[A-Da-d]*' | $TEST_COLLECT
+        run: cd packages/boot && yarn ${{ steps.vars.outputs.test }} | $TEST_COLLECT
       - name: notify on failure
         if: failure() && github.event_name != 'pull_request'
         uses: ./.github/actions/notify-status
@@ -543,7 +549,7 @@ jobs:
           datadog-token: ${{ secrets.DATADOG_API_KEY }}
           codecov-token: ${{ secrets.CODECOV_TOKEN }}
 
-  test-swingset2:
+  test-swingset:
     # BEGIN-TEST-BOILERPLATE
     timeout-minutes: 30
     needs: build
@@ -551,6 +557,9 @@ jobs:
     strategy:
       matrix:
         engine: ['18.x', '20.x', 'xs']
+        # Run parallel testing jobs, each executing a subset.
+        node_index: [0, 1, 2, 3, 4]
+        total_nodes: [5] # the total number of nodes
     steps:
       - name: set vars
         id: vars
@@ -558,6 +567,8 @@ jobs:
           echo "node-version=${{ matrix.engine == 'xs' && '18.x' || matrix.engine }}" >> $GITHUB_OUTPUT
           echo "test=${{ matrix.engine == 'xs' && 'test:xs' || 'test' }}" >> $GITHUB_OUTPUT
           echo "GH_ENGINE=${{ matrix.engine }}" >> $GITHUB_ENV
+          echo "CI_NODE_INDEX=${{ matrix.node_index }}" >> $GITHUB_ENV
+          echo "CI_NODE_TOTAL=${{ matrix.total_nodes }}" >> $GITHUB_ENV
 
       - uses: actions/checkout@v4
       - uses: ./.github/actions/restore-node
@@ -568,13 +579,7 @@ jobs:
       # END-TEST-BOILERPLATE
       - name: yarn test (SwingSet)
         if: (success() || failure())
-        run: cd packages/SwingSet && yarn ${{ steps.vars.outputs.test }} 'test/**/[E-Ie-i]*' | $TEST_COLLECT
-      - name: yarn test (xsnap-lockdown)
-        if: (success() || failure())
-        run: cd packages/xsnap-lockdown && yarn ${{ steps.vars.outputs.test }} | $TEST_COLLECT
-      - name: yarn test (xsnap)
-        if: (success() || failure())
-        run: cd packages/xsnap && yarn ${{ steps.vars.outputs.test }} | $TEST_COLLECT
+        run: cd packages/SwingSet && yarn ${{ steps.vars.outputs.test }} | $TEST_COLLECT
       # explicitly test the XS worker, for visibility
       - name: yarn test (SwingSet XS Worker)
         if: (success() || failure()) && matrix.engine != 'xs'
@@ -595,89 +600,6 @@ jobs:
           datadog-token: ${{ secrets.DATADOG_API_KEY }}
           codecov-token: ${{ secrets.CODECOV_TOKEN }}
 
-  test-swingset3:
-    # BEGIN-TEST-BOILERPLATE
-    timeout-minutes: 30
-    needs: build
-    runs-on: ubuntu-latest
-    strategy:
-      matrix:
-        engine: ['18.x', '20.x', 'xs']
-    steps:
-      - name: set vars
-        id: vars
-        run: |
-          echo "node-version=${{ matrix.engine == 'xs' && '18.x' || matrix.engine }}" >> $GITHUB_OUTPUT
-          echo "test=${{ matrix.engine == 'xs' && 'test:xs' || 'test' }}" >> $GITHUB_OUTPUT
-          echo "GH_ENGINE=${{ matrix.engine }}" >> $GITHUB_ENV
-      - uses: actions/checkout@v4
-      - uses: ./.github/actions/restore-node
-        with:
-          node-version: ${{ steps.vars.outputs.node-version }}
-        id: restore-node
-      - run: echo "ENDO_BRANCH=${{ steps.restore-node.outputs.endo-branch }}" >> $GITHUB_ENV
-      # END-TEST-BOILERPLATE
-      - name: yarn test (SwingSet)
-        if: (success() || failure())
-        run: cd packages/SwingSet && yarn ${{ steps.vars.outputs.test }} 'test/**/[J-Rj-r]*' | $TEST_COLLECT
-      - name: notify on failure
-        if: failure() && github.event_name != 'pull_request'
-        uses: ./.github/actions/notify-status
-        with:
-          webhook: ${{ secrets.SLACK_WEBHOOK_URL }}
-          from: ${{ secrets.NOTIFY_EMAIL_FROM }}
-          to: ${{ secrets.NOTIFY_EMAIL_TO }}
-          password: ${{ secrets.NOTIFY_EMAIL_PASSWORD }}
-      - uses: ./.github/actions/post-test
-        if: (success() || failure())
-        continue-on-error: true
-        timeout-minutes: 4
-        with:
-          datadog-token: ${{ secrets.DATADOG_API_KEY }}
-          codecov-token: ${{ secrets.CODECOV_TOKEN }}
-
-  test-swingset4:
-    # BEGIN-TEST-BOILERPLATE
-    timeout-minutes: 30
-    needs: build
-    runs-on: ubuntu-latest
-    strategy:
-      matrix:
-        engine: ['18.x', '20.x', 'xs']
-    steps:
-      - name: set vars
-        id: vars
-        run: |
-          echo "node-version=${{ matrix.engine == 'xs' && '18.x' || matrix.engine }}" >> $GITHUB_OUTPUT
-          echo "test=${{ matrix.engine == 'xs' && 'test:xs' || 'test' }}" >> $GITHUB_OUTPUT
-          echo "GH_ENGINE=${{ matrix.engine }}" >> $GITHUB_ENV
-      - uses: actions/checkout@v4
-      - uses: ./.github/actions/restore-node
-        with:
-          node-version: ${{ steps.vars.outputs.node-version }}
-        id: restore-node
-      - run: echo "ENDO_BRANCH=${{ steps.restore-node.outputs.endo-branch }}" >> $GITHUB_ENV
-      # END-TEST-BOILERPLATE
-
-      - name: yarn test (SwingSet)
-        if: (success() || failure())
-        run: cd packages/SwingSet && yarn ${{ steps.vars.outputs.test }} 'test/**/[S-Zs-z0-9.test]*.js' | $TEST_COLLECT
-      - name: notify on failure
-        if: failure() && github.event_name != 'pull_request'
-        uses: ./.github/actions/notify-status
-        with:
-          webhook: ${{ secrets.SLACK_WEBHOOK_URL }}
-          from: ${{ secrets.NOTIFY_EMAIL_FROM }}
-          to: ${{ secrets.NOTIFY_EMAIL_TO }}
-          password: ${{ secrets.NOTIFY_EMAIL_PASSWORD }}
-      - uses: ./.github/actions/post-test
-        if: (success() || failure())
-        continue-on-error: true
-        timeout-minutes: 4
-        with:
-          datadog-token: ${{ secrets.DATADOG_API_KEY }}
-          codecov-token: ${{ secrets.CODECOV_TOKEN }}
-
   test-zoe-unit:
     # BEGIN-TEST-BOILERPLATE
     timeout-minutes: 30