mousewheel is not completely smooth but still better than nothing

client.html

@@ -16,6 +16,7 @@
   <script src="https://cdnjs.cloudflare.com/ajax/libs/webrtc-adapter/8.1.2/adapter.min.js"></script>
   <style>
     * { margin: 0; padding: 0; box-sizing: border-box; }
+    html, body { overflow: hidden; }
     body {
       background: #000;
       display: flex;
@@ -653,16 +654,36 @@
       }
     }, 3000);
 
-    let lastMouseMove = 0;
+    // The actual network send happens in a requestAnimationFrame loop
+    // below instead of a manual setInterval-style throttle — RAF aligns
+    // with the browser's own natural scheduling/render cadence, which
+    // browsers are heavily optimized to prioritize correctly even under
+    // other event traffic (like rapid wheel scrolling)
+    let accumDx = 0, accumDy = 0;
+    let hasPendingMove = false;
     document.addEventListener('mousemove', e => {
       if (!pointerLocked || !isControlling) return;
-      const now = performance.now();
-      if (now - lastMouseMove < 16) return;
-      lastMouseMove = now;
-      sendInput({ type: 'mouse_move', dx: e.movementX * mouseSensitivity, dy: e.movementY * mouseSensitivity });
-      pingActive();
+      accumDx += e.movementX;
+      accumDy += e.movementY;
+      hasPendingMove = true;
     });
 
+    function rafMoveFlush() {
+      if (hasPendingMove) {
+        sendInput({ type: 'mouse_move', dx: accumDx * mouseSensitivity, dy: accumDy * mouseSensitivity });
+        accumDx = 0;
+        accumDy = 0;
+        hasPendingMove = false;
+        // No pingActive() here — it sends an actual WebSocket message every
+        // call, and this flush can run up to ~60x/sec during movement,
+        // doubling real network traffic during exactly the situation we're
+        // trying to lighten. The existing 3-second setInterval already
+        // keeps the idle timer alive without needing this.
+      }
+      requestAnimationFrame(rafMoveFlush);
+    }
+    requestAnimationFrame(rafMoveFlush);
+
     canvas.addEventListener('contextmenu', e => {
       e.preventDefault();
     });
@@ -680,12 +701,32 @@
     let lastMouseWheel = 0;
     canvas.addEventListener('wheel', e => {
       if (!pointerLocked || !isControlling) return;
-      e.preventDefault();
+      // No e.preventDefault() here anymore, and this listener is passive.
+      // preventDefault() on a non-passive wheel listener forces the browser
+      // to synchronously coordinate with its compositor thread on every
+      // single call — at 60-140 wheel events/sec (rapid scroll-jump
+      // spamming) that repeated synchronous cost was confirmed via the
+      // diagnostic counters above to correlate exactly with mousemove
+      // events dropping to zero during the same window: the browser was
+      // coalescing/dropping mouse movement entirely while busy handling
+      // the wheel events. Page scroll is prevented via CSS
+      // (html, body { overflow: hidden }) instead, which is free and
+      // doesn't require blocking per-event JS work.
       const now = performance.now();
-      if (now - lastMouseWheel < 16) return;
+      // 100ms instead of 16ms: jump timing has no real use for 60Hz
+      // precision (a single jump+land cycle takes far longer than that),
+      // and the diagnostic counters showed raw wheel dispatch hitting
+      // 70-80/sec during a fast physical flick — almost certainly the
+      // mouse wheel's hardware free-spinning generating many rapid encoder
+      // pulses from one gesture, not 70-80 deliberate jumps. This won't
+      // reduce how often the browser calls this handler, but it does cut
+      // the actual sendInput -> WebSocket -> xdotool-click work by a large
+      // factor, which was still contributing some interference even after
+      // removing preventDefault().
+      if (now - lastMouseWheel < 100) return;
       lastMouseWheel = now;
       sendInput({ type: 'mouse_wheel', direction: e.deltaY < 0 ? 'up' : 'down' });
-    }, { passive: false });
+    }, { passive: true });
 
     const KEY_MAP = {
       'KeyW': 'w', 'KeyA': 'a', 'KeyS': 's', 'KeyD': 'd',