- use tokio instead of os threads

- buffer writes
- also write in parallel

.github/workflows/pytest.yml

@@ -4,19 +4,63 @@ on: [push, pull_request, workflow_call]
 
 jobs:
   pytest:
-    runs-on: ${{ matrix.os }}
+    runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ["3.10", "3.12", "3.13"]
-        os: [ubuntu-latest, windows-latest, macOS-latest]
+        python-version: ["3.10", "3.12", "3.14"]
 
     steps:
       - uses: actions/checkout@v6
       - name: Set up Python ${{ matrix.python-version }}
-        uses: actions/setup-python@v6
+        uses: actions/setup-python@v5
         with:
           python-version: ${{ matrix.python-version }}
+
+      - name: Restore cache
+        uses: actions/cache/restore@v4
+        with:
+          path: |
+            ~/.cache/pip
+            ~/.cache/pip-wheel
+            ~/.cache/sccache
+            ~/.cache/cargo-xwin
+            ~/.cargo
+            ~/.osxcross
+          key: cache-ubuntu-maturin-cross-compile
+
+      - name: Install Rust
+        run: |
+          export PATH="$HOME/.cargo/bin:$PATH"
+          if ! command -v rustc >/dev/null 2>&1; then
+            curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y
+          else
+            rustup update
+          fi
+        shell: bash
+
+      - name: Install sccache and maturin
+        run: |
+          export PATH="$HOME/.cargo/bin:$PATH"
+          python -m pip install --upgrade pip
+          pip install maturin ziglang
+          if ! command -v sccache >/dev/null 2>&1; then
+            cargo install sccache || pip install sccache
+          fi
+        shell: bash
+
       - name: Install
         run: pip install .[test]
       - name: Test with pytest
-        run: pytest
+        run: pytest
+
+      - name: Store cache
+        uses: actions/cache/save@v4
+        with:
+          path: |
+            ~/.cache/pip
+            ~/.cache/pip-wheel
+            ~/.cache/sccache
+            ~/.cache/cargo-xwin
+            ~/.cargo
+            ~/.osxcross
+          key: cache-ubuntu-maturin-cross-compile