diff --git a/src/main.js b/src/main.js
index 2072350..12a4b5d 100644
--- a/src/main.js
+++ b/src/main.js
@@ -270,7 +270,7 @@ class Demo {
 		}
 	}
 
-	draw({context, height, width, scale, locationSets, now, lastNow}) {
+	draw({context, height, width, scale, interacted, moved, locationSets, now, lastNow}) {
 		this.counts = [
 			0, // tiles
 			0, // pips
@@ -310,6 +310,8 @@ class Demo {
 //		});
 
 		this.fps.frame(now, lastNow, this.counts);
+
+		return interacted || moved || this.ripples.length ? 0 : 100;
 	}
 }
 
diff --git a/src/sketch.js b/src/sketch.js
index 66cc8d3..963c7f2 100644
--- a/src/sketch.js
+++ b/src/sketch.js
@@ -13,7 +13,6 @@ export default class Sketch {
 
 		this.draw = settings.draw || noop;
 		this.resize = settings.resize || noop;
-		this.drawDelay = settings.drawDelay;
 		this.container = settings.element || document.body;
 
 		window.addEventListener('resize', this.onResize);
@@ -69,11 +68,11 @@ export default class Sketch {
 		this.context.now = now;
 		this.context.lastNow = this.lastNow;
 
-		this.draw(this.context);
+		const drawDelay = this.draw(this.context);
 
 		this.lastNow = now;
 
-		if (this.drawDelay) setTimeout(() => requestAnimationFrame(this.render), this.drawDelay);
+		if (drawDelay) setTimeout(() => requestAnimationFrame(this.render), drawDelay);
 		else requestAnimationFrame(this.render);
 	}
 }
diff --git a/src/tessellate.js b/src/tessellate.js
index ce5c648..6e348ea 100644
--- a/src/tessellate.js
+++ b/src/tessellate.js
@@ -95,11 +95,11 @@ export class Tessellate {
 
 		this.checkSettings(settings);
 
-		this.sketch = new Sketch(Object.assign({
+		this.sketch = new Sketch({
 			element: this.settings.element,
 			draw: this.draw,
 			resize: this.resize,
-		}, funky.pick(this.settings, ['drawDelay'])));
+		});
 
 		this.onTap = new OnTap(Object.assign({
 			element: this.settings.element,
@@ -152,6 +152,8 @@ export class Tessellate {
 		const tile = this.cartographer.pixelToTile(point);
 		const mapTile = this.cartographer.teleport(tile);
 
+		this.interacted = true;
+
 		this.settings.tap({
 			event,
 			mapTile,
@@ -166,6 +168,8 @@ export class Tessellate {
 		const tile = this.cartographer.pixelToTile(point);
 		const mapTile = this.cartographer.teleport(tile);
 
+		this.interacted = true;
+
 		let tap = {
 			event,
 			map,
@@ -182,20 +186,7 @@ export class Tessellate {
 		const tile = this.cartographer.pixelToTile(point);
 		const mapTile = this.cartographer.teleport(tile);
 
-		let tap = {
-			event,
-			mapTile,
-			point,
-			tile
-		};
-
-		console.log(tap);
-	}
-
-	pressStart (event) {
-		const point = new Point(event.offsetX, event.offsetY);
-		const tile = this.cartographer.pixelToTile(point);
-		const mapTile = this.cartographer.teleport(tile);
+		this.interacted = true;
 
 		this.settings.pressStart({
 			event,
@@ -210,6 +201,8 @@ export class Tessellate {
 		const tile = this.cartographer.pixelToTile(point);
 		const mapTile = this.cartographer.teleport(tile);
 
+		this.interacted = true;
+
 		this.settings.press({
 			event,
 			mapTile,
@@ -234,7 +227,25 @@ export class Tessellate {
 		return this.cartographer.tileToPixel(tilePoint);
 	}
 
-	getLocationSets ({upperLeftX, upperLeftY, lowerRightX, lowerRightY}) {
+	newLocation (corners) {
+		this.lastLocation = this.lastLocation || {};
+
+		const currentLocation = utils.extend({
+			originX: this.cartographer.getOriginX(),
+			originY: this.cartographer.getOriginY(),
+			scaleOrig: this.cartographer.getScale(),
+		}, corners);
+
+		const changed = funky.reduce(currentLocation, (same, val, key) => same || this.lastLocation[key] !== val, false);
+
+		this.lastLocation = currentLocation;
+
+		return changed;
+	}
+
+	getLocationSets (corners) {
+		const {upperLeftX, upperLeftY, lowerRightX, lowerRightY} = corners;
+
 		const upperLeft =  new Point(upperLeftX, upperLeftY);
 		const upperRight = new Point(lowerRightX, 0);
 		const lowerLeft =  new Point(0, lowerRightY);
@@ -255,9 +266,13 @@ export class Tessellate {
 			lowerRightY: height
 		};
 
-		const locationSets = this.getLocationSets(corners);
+		const interacted = this.interacted;
+		this.interacted = false;
 
-		this.settings.draw({
+		const moved = this.newLocation(corners);
+		this.locationSets = moved ? this.getLocationSets(corners) : this.locationSets;
+
+		return this.settings.draw({
 			context,
 
 			height, width,
@@ -266,7 +281,9 @@ export class Tessellate {
 			lastNow: context.lastUTC,
 			now: context.utc,
 
-			locationSets,
+			interacted,
+			moved,
+			locationSets: this.locationSets,
 		});
 	}