diff --git a/src/components/three/XRControllerMeasure.tsx b/src/components/three/XRControllerMeasure.tsx
index d5ef45c..f4a3768 100644
--- a/src/components/three/XRControllerMeasure.tsx
+++ b/src/components/three/XRControllerMeasure.tsx
@@ -49,12 +49,21 @@ export function XRControllerMeasure() {
   const dwellStart = useRef(0);
   const dwellFired = useRef(false);
 
+  // Throttling: raycast + snap analysis are heavy on dense IFC models and
+  // running them every frame at 72fps can stall the Quest right after
+  // toggling "Medir" from the Ferramentas tab. We cap heavy work to ~24Hz.
+  // Trigger/A/B/L-trigger polling continues every frame for responsiveness.
+  const heavyFrame = useRef(0);
+  const cachedSnappedPoint = useRef<THREE.Vector3 | null>(null);
+  const cachedSnapKind = useRef<'vertex' | 'edge' | 'surface' | 'hole'>('surface');
+
   useFrame((_state, _dt, frame: XRFrame | undefined) => {
     const measureMode = useModelStore.getState().measureMode;
     const selectionMode = useModelStore.getState().selectionMode;
     if (laserRef.current) laserRef.current.visible = false;
     if (tipRef.current) tipRef.current.visible = false;
     if ((!measureMode && !selectionMode) || !frame) return;
+    const doHeavy = (heavyFrame.current++ % 3) === 0;
 
     const session = frame.session;
     const refSpace = gl.xr.getReferenceSpace();