diff --git a/tools/live/m4.ts b/tools/live/m4.ts
index dadc647..2d18ab5 100644
--- a/tools/live/m4.ts
+++ b/tools/live/m4.ts
@@ -2,8 +2,10 @@
 // is, and how many updates dragging a device makes. Mia drags a device in a
 // real browser for two seconds at 60 pointer moves a second (as a finger or
 // a mouse does); a second person, watching through /sync, counts the updates
-// that arrive and their bytes. Then the document's size as F holds it: fresh,
-// after the drags, and as one update (what a new person loads).
+// that arrive and their bytes, and the presence changes Mia's editor sends
+// meanwhile (since F5.6d the drag goes there, the document gets its end).
+// Then the document's size as F holds it: fresh, after the drags, and as one
+// update (what a new person loads).
 //
 //   npx vite-node tools/live/m4.ts
 
@@ -28,8 +30,12 @@ try {
   watcher.doc.on('update', (update: Uint8Array, origin: unknown) => {
     if (origin !== null && typeof origin === 'object') arrivals.push({ at: performance.now(), bytes: update.length });
   });
+  let presence = 0;
+  const awareness = watcher.provider.awareness;
+  awareness.on('change', ({ updated }: { updated: number[] }) => (presence += updated.filter((client) => client !== awareness.clientID).length));
   for (const name of ['Heimrouter', 'webserver.de (120.130.140.80)', 'iPad 1']) {
     arrivals.length = 0;
+    presence = 0;
     const from = await onDevice(page, example.graph.nodes.find((node) => node.displayName === name)!.id);
     await page.mouse.move(from.x, from.y);
     await page.mouse.down();
@@ -45,7 +51,7 @@ try {
     await new Promise((resolve) => setTimeout(resolve, 1500));
     const bytes = arrivals.reduce((sum, each) => sum + each.bytes, 0);
     console.log(
-      `drag ${name.padEnd(30)} ${dragged.toFixed(1)} s: ${arrivals.length} updates (${(arrivals.length / dragged).toFixed(0)}/s), ${bytes} bytes, ${(bytes / Math.max(1, arrivals.length)).toFixed(0)} per update`,
+      `drag ${name.padEnd(30)} ${dragged.toFixed(1)} s: ${arrivals.length} updates (${(arrivals.length / dragged).toFixed(0)}/s), ${bytes} bytes, ${(bytes / Math.max(1, arrivals.length)).toFixed(0)} per update; ${presence} presence changes (${(presence / dragged).toFixed(0)}/s)`,
     );
   }
   console.log(`after the drags: ${Y.encodeStateAsUpdate(watcher.doc).length} bytes as one update`);