test: add base perf test case

__tests__/demos/perf/index.ts

@@ -1 +1,2 @@
 export { circles } from './circles';
+export { rects } from './rect';

__tests__/demos/perf/rect.ts

@@ -0,0 +1,47 @@
+import { Rect, Group, runtime } from '@antv/g';
+import type { Canvas } from '@antv/g';
+
+runtime.enableCSSParsing = false;
+
+export async function rects(context: { canvas: Canvas }) {
+  const { canvas } = context;
+
+  await canvas.ready;
+
+  const group1 = new Group({});
+  const group2 = group1.appendChild(new Group({}));
+  canvas.appendChild(group2);
+
+  console.time('render');
+
+  for (let i = 0; i < 10_0000; i++) {
+    const group = new Group({
+      style: {
+        // transform: [['translate', Math.random() * 640, Math.random() * 640]],
+        transform: `translate(${Math.random() * 640}, ${Math.random() * 640})`,
+      },
+    });
+
+    group.appendChild(
+      new Rect({
+        style: {
+          width: 10,
+          height: 10,
+          fill: '#1890FF',
+          stroke: '#F04864',
+          lineWidth: 4,
+        },
+      }),
+    );
+
+    group2.appendChild(group);
+  }
+
+  canvas.addEventListener(
+    'rerender',
+    () => {
+      console.timeEnd('render');
+    },
+    { once: true },
+  );
+}