diff --git a/.github/workflows/lint.yaml b/.github/workflows/lint.yaml
index 5f6c971e7..ff1d367c9 100644
--- a/.github/workflows/lint.yaml
+++ b/.github/workflows/lint.yaml
@@ -1,4 +1,4 @@
-name: golangci-lint
+name: Lint Checks
 on:
   pull_request:
 permissions:
@@ -23,3 +23,7 @@ jobs:
       - name: Check go.mod
         run: |
           go mod tidy && git diff --exit-code
+
+      - name: Check natives build tags
+        run: |
+          diff -u <(echo -n) <(go list ./compiler/natives/src/...) # All those packages should have // +build js.
diff --git a/.github/workflows/measure-size.yml b/.github/workflows/measure-size.yml
index d193b0df6..1c764cd0c 100644
--- a/.github/workflows/measure-size.yml
+++ b/.github/workflows/measure-size.yml
@@ -1,28 +1,29 @@
-name: Measure canonical app size
+# Temporarily disabling this, to avoid cluttering the PR. I won't merge this commit
+# name: Measure canonical app size
 
-on: ['pull_request']
+# on: ['pull_request']
 
-jobs:
-  measure:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v2
-        with:
-          fetch-depth: 0
-      - uses: actions/setup-go@v2
-        with:
-          go-version: '~1.18.10'
-      - uses: gopherjs/output-size-action/measure@main
-        with:
-          name: jQuery TodoMVC
-          repo: https://github.com/gopherjs/todomvc
-          go-package: github.com/gopherjs/todomvc
-          report_json: /tmp/report.json
-          report_md: /tmp/report.md
-      - uses: actions/upload-artifact@v2
-        with:
-          name: size_report
-          path: |
-            /tmp/report.json
-            /tmp/report.md
+# jobs:
+#   measure:
+#     runs-on: ubuntu-latest
+#     steps:
+#       - uses: actions/checkout@v2
+#         with:
+#           fetch-depth: 0
+#       - uses: actions/setup-go@v2
+#         with:
+#           go-version: '~1.18.10'
+#       - uses: gopherjs/output-size-action/measure@main
+#         with:
+#           name: jQuery TodoMVC
+#           repo: https://github.com/gopherjs/todomvc
+#           go-package: github.com/gopherjs/todomvc
+#           report_json: /tmp/report.json
+#           report_md: /tmp/report.md
+#       - uses: actions/upload-artifact@v2
+#         with:
+#           name: size_report
+#           path: |
+#             /tmp/report.json
+#             /tmp/report.md
 
diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
new file mode 100644
index 000000000..537923131
--- /dev/null
+++ b/.github/workflows/tests.yml
@@ -0,0 +1,173 @@
+name: Tests
+on:
+  pull_request:
+permissions:
+  contents: read
+jobs:
+  tests:
+    name: tests
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-latest, macos-latest, windows-latest]
+        include:
+          - os: ubuntu-latest
+            index: 0
+          - os: ubuntu-latest
+            index: 1
+          - os: ubuntu-latest
+            index: 2
+          - os: ubuntu-latest
+            index: 3
+
+    steps:
+      - uses: actions/setup-go@v3
+        with:
+          go-version: "1.18.10"
+      - uses: actions/setup-node@v3
+        with:
+          node-version: "12"
+      - name: Set up environment
+        if: matrix.os != 'windows-latest'
+        run: |
+          echo "SOURCE_MAP_SUPPORT=true" >> $GITHUB_ENV
+          # Make nodejs able to require installed modules from any working path.
+          echo "NODE_PATH=$(npm root)" >> $GITHUB_ENV
+          echo ::notice::$(go version)
+          echo ::notice::$(node -v)
+          echo ::notice::$(npm -v)
+      - name: Set up environment
+        if: matrix.os == 'windows-latest'
+        run: |
+          # Fix TEMP variable, see https://github.com/actions/runner-images/issues/712#issuecomment-613004302
+          echo "TEMP=$env:USERPROFILE\AppData\Local\Temp" >> $env:GITHUB_ENV
+          echo "TMP=$env:USERPROFILE\AppData\Local\Temp" >> $env:GITHUB_ENV
+          echo "TMPDIR=$env:USERPROFILE\AppData\Local\Temp" >> $env:GITHUB_ENV
+          echo "NODE_PATH=$(npm root)" >> $env:GITHUB_ENV
+          echo "SOURCE_MAP_SUPPORT=false" >> $env:GITHUB_ENV
+          echo "::notice::$(npm root)"
+          echo "::notice::$(node -v)"
+          echo "::notice::$(npm -v)"
+      - uses: actions/checkout@v3
+      - name: Install required Node.js packages
+        if: matrix.os == 'ubuntu-latest'
+        run: |
+          npm ci
+      - name: Install required Node.js packages
+        if: matrix.os != 'ubuntu-latest'
+        run: |
+          # Extra flags to avoid installing node-syscall.
+          npm install --no-optional --no-package-lock
+      - name: Build and Install GopherJS
+        run: |
+          go install -v
+          echo ::notice::$(gopherjs version)
+
+      - name: Smoke tests
+        if: matrix.os == 'ubuntu-latest'
+        run: |
+          gopherjs build -v net/http
+          gopherjs test -v fmt log
+      - name: Smoke tests
+        if: matrix.os == 'macos-latest'
+        run: |
+          gopherjs build -v net/http
+          gopherjs test -v --short fmt log os ./tests
+      - name: Smoke tests
+        if: matrix.os == 'windows-latest'
+        run: |
+          gopherjs build -v net/http
+          gopherjs test -v --short fmt sort ./tests
+      - name: go test ...
+        if: matrix.os != 'windows-latest'
+        run: |
+          # Run all tests except gorepo, which will be run separately in parallel.
+          go test -v -race $(go list ./... | grep -v github.com/gopherjs/gopherjs/tests/gorepo)
+      - name: go test ...
+        if: matrix.os == 'windows-latest'
+        run: |
+          $ErrorActionPreference = "Stop"
+          # Run all tests except gorepo, which will be run separately in parallel.
+          go test -v -race $(go list ./... | Where-Object { $_ -notmatch "github.com/gopherjs/gopherjs/tests/gorepo" })
+      - name: TodoMVC in GOPATH mode
+        if: matrix.os != 'windows-latest'
+        run: |
+          set -e
+          export GO111MODULE=off
+          export GOPATH=/tmp/gopath
+          mkdir -p $GOPATH/src/github.com/gopherjs/gopherjs
+          cp -r -p . $GOPATH/src/github.com/gopherjs/gopherjs/
+          go get -v github.com/gopherjs/todomvc
+          gopherjs build -v -o /tmp/todomvc_gopath.js github.com/gopherjs/todomvc
+          gopherjs test -v github.com/gopherjs/todomvc/...
+      - name: TodoMVC in GOPATH mode
+        if: matrix.os == 'windows-latest'
+        run: |
+          $ErrorActionPreference = "Stop"
+          $env:GO111MODULE = "off"
+          $env:GOPATH = "C:\tmp\gopath"
+          $destinationPath = "$env:GOPATH\src\github.com\gopherjs\gopherjs"
+          if (-not (Test-Path $destinationPath)) {
+            New-Item -ItemType Directory -Force -Path $destinationPath
+          }
+          Copy-Item -Recurse -Path . -Destination $destinationPath
+          go get -v github.com/gopherjs/todomvc
+          gopherjs build -v -o C:\tmp\todomvc_gopath.js github.com/gopherjs/todomvc
+          gopherjs test -v github.com/gopherjs/todomvc/...
+      - name: TodoMVC in Modules mode
+        if: matrix.os != 'windows-latest'
+        run: |
+          set -e
+          cd /tmp
+          git clone --depth=1 https://github.com/gopherjs/todomvc.git
+          cd /tmp/todomvc
+          gopherjs build -v -o /tmp/todomvc_gomod.js github.com/gopherjs/todomvc
+          gopherjs test -v github.com/gopherjs/todomvc/...
+      - name: TodoMVC in Modules mode
+        if: matrix.os == 'windows-latest'
+        run: |
+          $ErrorActionPreference = "Stop"
+          Set-Location C:\tmp
+          git clone --depth=1 https://github.com/gopherjs/todomvc.git
+          Set-Location C:\tmp\todomvc
+          gopherjs build -v -o C:\tmp\todomvc_gomod.js github.com/gopherjs/todomvc
+          gopherjs test -v github.com/gopherjs/todomvc/...
+      - name: Go Repository tests
+        run: |
+          go test -v github.com/gopherjs/gopherjs/tests/gorepo
+
+      - name: Download JUnit Summary from Previous Workflow
+        if: matrix.index
+        id: download-artifact
+        uses: dawidd6/action-download-artifact@v2
+        with:
+          workflow_conclusion: success
+          name: junit-test-summary
+          if_no_artifact_found: warn
+          # Uncomment the next line before pushing to main branch, that way all branches can
+          # benefit from timing data once it's established there.
+          # branch: main
+
+      - name: Install gotestsum
+        if: matrix.index
+        run: go install gotest.tools/gotestsum@latest
+      - name: Generate go test Slice
+        if: matrix.index
+        id: test_split
+        env:
+          GOOS: js
+          GOARCH: ecmascript
+        uses: hashicorp-forge/go-test-split-action@v1
+        with:
+          total: 4
+          index: ${{ matrix.index }}
+          packages: "std github.com/gopherjs/gopherjs/js/... github.com/gopherjs/gopherjs/tests/..."
+      - name: gopherjs test ...
+        if: matrix.index
+        run: |
+          set -e
+          ulimit -s 10000
+
+          PACKAGE_NAMES=$(for pkg in ${{ steps.test_split.outputs.run }}; do echo "$pkg"; done | grep -v -x -f .std_test_pkg_exclusions)
+
+          gopherjs test -p 2 --minify -v --short "${{ steps.test_split.outputs.run }}"
diff --git a/circle.yml b/circle.yml
index 12b0aa45f..98b29b114 100644
--- a/circle.yml
+++ b/circle.yml
@@ -41,15 +41,6 @@ workflows:
     - gopherjs_tests:
         requires:
           - build
-    - gorepo_tests:
-        requires:
-          - build
-    - darwin_smoke:
-        requires:
-          - build
-    - windows_smoke:
-        requires:
-          - build
 
 parameters:
   go_version:
@@ -72,27 +63,6 @@ jobs:
     executor: gopherjs
     steps:
     - setup_and_install_gopherjs
-    - run:
-        name: Check natives build tags
-        command: diff -u <(echo -n) <(go list ./compiler/natives/src/...) # All those packages should have // +build js.
-    - run:
-        name: Smoke tests
-        command: |
-          gopherjs build -v net/http # Should build successfully.
-          gopherjs test -v fmt log # Should catch problems with test execution and source maps.
-    - run:
-        name: go test ...
-        command: |
-          set +e
-          # Run all tests except gorepo, which will be run separately in parallel.
-          go test -v -race $(go list ./... | grep -v github.com/gopherjs/gopherjs/tests/gorepo) | tee /tmp/test-go.txt
-          status="$?"
-          # Convert test output into junit format for CircleCI.
-          mkdir -p ~/test-reports/
-          go-junit-report --full-class-name < /tmp/test-go.txt > ~/test-reports/go.xml
-          exit "$status"
-    - store_test_results:
-        path: ~/test-reports/
     - run:
         name: TodoMVC in GOPATH mode
         command: |
@@ -149,74 +119,6 @@ jobs:
     - store_test_results:
         path: ~/test-reports/
 
-  gorepo_tests:
-    executor: gopherjs
-    parallelism: 4
-    steps:
-    - setup_environment
-    - checkout
-    - install_deps
-    - install_gopherjs
-    - run:
-        name: Go Repository tests
-        command: |
-          go test -v github.com/gopherjs/gopherjs/tests/gorepo
-
-  windows_smoke:
-    executor:
-      name: win/default
-      shell: powershell.exe
-    steps:
-      - checkout
-      - run:
-          name: Install Go
-          command: |
-            choco install golang --version="<< pipeline.parameters.go_version >>" -my
-            go version
-            (Get-Command go).Path
-            [Environment]::SetEnvironmentVariable(
-              "Path",
-              [Environment]::GetEnvironmentVariable("Path", [EnvironmentVariableTarget]::Machine) + ";C:\Users\circleci\go\bin",
-              [EnvironmentVariableTarget]::Machine)
-
-      - install_deps:
-          optional: false
-      - run: 
-          name: Install GopherJS
-          command: 
-            go install -v .
-            (Get-Command gopherjs).Path
-      - run: 
-          name: Test GopherJS
-          command: go test -v -short ./...
-      - run:
-          name: Smoke tests
-          command: |
-            $env:NODE_PATH=$(npm root)
-            $env:SOURCE_MAP_SUPPORT=false
-            gopherjs build -v net/http
-            gopherjs test -v --short fmt sort ./tests
-    
-  darwin_smoke:
-    macos:
-      xcode: 13.4.1 # Mac OS 12.6.1, see https://circleci.com/docs/using-macos/
-    steps:
-      - checkout
-      - setup_environment
-      - install_deps:
-          optional: false
-      - run: 
-          name: Install GopherJS
-          command: go install -v .
-      - run: 
-          name: Test GopherJS
-          command: go test -v -short ./...
-      - run:
-          name: Smoke tests
-          command: |
-            gopherjs build -v net/http
-            gopherjs test -v --short fmt log os ./tests
-
 commands:
   setup_environment:
     description: Set up Go, NVM and Node.js