diff --git a/packages/editor/api-report.md b/packages/editor/api-report.md
index 2310050a1..c553624ad 100644
--- a/packages/editor/api-report.md
+++ b/packages/editor/api-report.md
@@ -676,7 +676,7 @@ export class Editor extends EventEmitter<TLEventMap> {
     getCrashingError(): unknown;
     getCroppingShapeId(): null | TLShapeId;
     // (undocumented)
-    getCulledShapes(): Map<TLShapeId, Box | undefined>;
+    getCulledShapes(): Set<TLShapeId>;
     getCurrentPage(): TLPage;
     getCurrentPageBounds(): Box | undefined;
     getCurrentPageId(): TLPageId;
diff --git a/packages/editor/api/api.json b/packages/editor/api/api.json
index 229ca2636..5788b96b0 100644
--- a/packages/editor/api/api.json
+++ b/packages/editor/api/api.json
@@ -10295,8 +10295,8 @@
                 },
                 {
                   "kind": "Reference",
-                  "text": "Map",
-                  "canonicalReference": "!Map:interface"
+                  "text": "Set",
+                  "canonicalReference": "!Set:interface"
                 },
                 {
                   "kind": "Content",
@@ -10309,16 +10309,7 @@
                 },
                 {
                   "kind": "Content",
-                  "text": ", "
-                },
-                {
-                  "kind": "Reference",
-                  "text": "Box",
-                  "canonicalReference": "@tldraw/editor!Box:class"
-                },
-                {
-                  "kind": "Content",
-                  "text": " | undefined>"
+                  "text": ">"
                 },
                 {
                   "kind": "Content",
@@ -10328,7 +10319,7 @@
               "isStatic": false,
               "returnTypeTokenRange": {
                 "startIndex": 1,
-                "endIndex": 7
+                "endIndex": 5
               },
               "releaseTag": "Public",
               "isProtected": false,
diff --git a/packages/editor/src/lib/components/CulledShapes.tsx b/packages/editor/src/lib/components/CulledShapes.tsx
index 88e7d15f3..09fd40adc 100644
--- a/packages/editor/src/lib/components/CulledShapes.tsx
+++ b/packages/editor/src/lib/components/CulledShapes.tsx
@@ -1,5 +1,4 @@
 import { computed, react } from '@tldraw/state'
-import { measureCbDuration } from '@tldraw/utils'
 import { useEffect, useRef } from 'react'
 import { useEditor } from '../hooks/useEditor'
 import { useIsDarkMode } from '../hooks/useIsDarkMode'
@@ -111,32 +110,32 @@ export function CulledShapes() {
 		} = webGl
 
 		const shapeVertices = computed('shape vertices', function calculateCulledShapeVertices() {
-			const results: number[] = []
+			return []
+			// const results: number[] = []
+			// return measureCbDuration('vertices', () => {
+			// 	editor.getCulledShapes().forEach((maskedPageBounds) => {
+			// 		if (maskedPageBounds) {
+			// 			results.push(
+			// 				// triangle 1
+			// 				maskedPageBounds.minX,
+			// 				maskedPageBounds.minY,
+			// 				maskedPageBounds.minX,
+			// 				maskedPageBounds.maxY,
+			// 				maskedPageBounds.maxX,
+			// 				maskedPageBounds.maxY,
+			// 				// triangle 2
+			// 				maskedPageBounds.minX,
+			// 				maskedPageBounds.minY,
+			// 				maskedPageBounds.maxX,
+			// 				maskedPageBounds.minY,
+			// 				maskedPageBounds.maxX,
+			// 				maskedPageBounds.maxY
+			// 			)
+			// 		}
+			// 	})
 
-			return measureCbDuration('vertices', () => {
-				editor.getCulledShapes().forEach((maskedPageBounds) => {
-					if (maskedPageBounds) {
-						results.push(
-							// triangle 1
-							maskedPageBounds.minX,
-							maskedPageBounds.minY,
-							maskedPageBounds.minX,
-							maskedPageBounds.maxY,
-							maskedPageBounds.maxX,
-							maskedPageBounds.maxY,
-							// triangle 2
-							maskedPageBounds.minX,
-							maskedPageBounds.minY,
-							maskedPageBounds.maxX,
-							maskedPageBounds.minY,
-							maskedPageBounds.maxX,
-							maskedPageBounds.maxY
-						)
-					}
-				})
-
-				return results
-			})
+			// 	return results
+			// })
 		})
 
 		return react('render culled shapes ', function renderCulledShapes() {
diff --git a/packages/editor/src/lib/components/default-components/DefaultCanvas.tsx b/packages/editor/src/lib/components/default-components/DefaultCanvas.tsx
index 3f89197b1..2a19d02d0 100644
--- a/packages/editor/src/lib/components/default-components/DefaultCanvas.tsx
+++ b/packages/editor/src/lib/components/default-components/DefaultCanvas.tsx
@@ -20,7 +20,6 @@ import { toDomPrecision } from '../../primitives/utils'
 import { debugFlags } from '../../utils/debug-flags'
 import { setStyleProperty } from '../../utils/dom'
 import { nearestMultiple } from '../../utils/nearestMultiple'
-import { CulledShapes } from '../CulledShapes'
 import { GeometryDebuggingView } from '../GeometryDebuggingView'
 import { LiveCollaborators } from '../LiveCollaborators'
 import { Shape } from '../Shape'
@@ -97,9 +96,9 @@ export function DefaultCanvas({ className }: TLCanvasComponentProps) {
 					<Background />
 				</div>
 			)}
-			<div className="tl-culled-shapes">
+			{/* <div className="tl-culled-shapes">
 				<CulledShapes />
-			</div>
+			</div> */}
 			<div
 				ref={rCanvas}
 				draggable={false}
diff --git a/packages/editor/src/lib/editor/Editor.ts b/packages/editor/src/lib/editor/Editor.ts
index e46cc24f5..9112cd20d 100644
--- a/packages/editor/src/lib/editor/Editor.ts
+++ b/packages/editor/src/lib/editor/Editor.ts
@@ -1,4 +1,4 @@
-import { EMPTY_ARRAY, RESET_VALUE, atom, computed, isUninitialized, transact } from '@tldraw/state'
+import { EMPTY_ARRAY, atom, computed, transact } from '@tldraw/state'
 import { ComputedCache, RecordType, StoreSnapshot } from '@tldraw/store'
 import {
 	CameraRecordType,
@@ -102,6 +102,7 @@ import { getReorderingShapesChanges } from '../utils/reorderShapes'
 import { applyRotationToSnapshotShapes, getRotationSnapshot } from '../utils/rotation'
 import { uniqueId } from '../utils/uniqueId'
 import { arrowBindingsIndex } from './derivations/arrowBindingsIndex'
+import { culledShapes } from './derivations/culledShapes'
 import { parentsToChildren } from './derivations/parentsToChildren'
 import { deriveShapeIdsInCurrentPage } from './derivations/shapeIdsInCurrentPage'
 import { getSvgJsx } from './getSvgJsx'
@@ -612,6 +613,7 @@ export class Editor extends EventEmitter<TLEventMap> {
 			this.getCurrentPageId()
 		)
 		this._parentIdsToChildIds = parentsToChildren(this.store)
+		this._culledShapes = culledShapes(this)
 
 		this.disposables.add(
 			this.store.listen((changes) => {
@@ -4247,127 +4249,18 @@ export class Editor extends EventEmitter<TLEventMap> {
 		return this.isShapeOrAncestorLocked(this.getShapeParent(shape))
 	}
 
-	private _getShapeCullingInfo(
-		id: TLShapeId,
-		selectedShapeIds: TLShapeId[],
-		editingId: TLShapeId | null,
-		renderingBoundsExpanded: Box
-	): { isCulled: false } | { isCulled: true; maskedPageBounds: Box | undefined } {
-		if (editingId === id) return { isCulled: false }
-
-		const maskedPageBounds = this.getShapeMaskedPageBounds(id)
-		// if the shape is fully outside of its parent's clipping bounds...
-		if (maskedPageBounds === undefined) return { isCulled: true, maskedPageBounds: undefined }
-
-		// We don't cull selected shapes
-		if (selectedShapeIds.includes(id)) return { isCulled: false }
-		// the shape is outside of the expanded viewport bounds...
-
-		const isCulled = !renderingBoundsExpanded.includes(maskedPageBounds)
-		return isCulled ? { isCulled, maskedPageBounds } : { isCulled }
-	}
-
-	getCulledShapes(): Map<TLShapeId, Box | undefined> {
-		return this._getCulledShapes().get()
-	}
-
 	@computed
-	private _getCulledShapes() {
-		const isCullingOffScreenShapes = Number.isFinite(this.renderingBoundsMargin)
-
-		const shapeHistory = this.store.query.filterHistory('shape')
-		let lastPageId: TLPageId | null = null
-		let prevRenderingBoundsExpanded: Box
-
-		function fromScratch(editor: Editor): Map<TLShapeId, Box | undefined> {
-			const renderingBoundsExpanded = editor.getRenderingBoundsExpanded()
-			prevRenderingBoundsExpanded = renderingBoundsExpanded.clone()
-			lastPageId = editor.getCurrentPageId()
-			const shapes = editor.getCurrentPageShapeIds()
-			const culledShapes = new Map<TLShapeId, Box | undefined>()
-			const selectedShapeIds = editor.getSelectedShapeIds()
-			const editingId = editor.getEditingShapeId()
-			shapes.forEach((id) => {
-				const ci = editor._getShapeCullingInfo(
-					id,
-					selectedShapeIds,
-					editingId,
-					renderingBoundsExpanded
-				)
-				if (ci.isCulled) {
-					culledShapes.set(id, ci.maskedPageBounds)
-				}
-			})
-			return culledShapes
-		}
-		return computed<Map<TLShapeId, Box | undefined>>(
-			'getCulledShapes',
-			(prevValue, lastComputedEpoch) => {
-				if (!isCullingOffScreenShapes) return new Map<TLShapeId, Box | undefined>()
-
-				if (isUninitialized(prevValue)) {
-					return fromScratch(this)
-				}
-				const diff = shapeHistory.getDiffSince(lastComputedEpoch)
-
-				if (diff === RESET_VALUE) {
-					return fromScratch(this)
-				}
-
-				const currentPageId = this.getCurrentPageId()
-				if (lastPageId !== currentPageId) {
-					return fromScratch(this)
-				}
-				const renderingBoundsExpanded = this.getRenderingBoundsExpanded()
-				if (
-					!prevRenderingBoundsExpanded ||
-					!renderingBoundsExpanded.equals(prevRenderingBoundsExpanded)
-				) {
-					return fromScratch(this)
-				}
-				const selectedShapeIds = this.getSelectedShapeIds()
-				const editingId = this.getEditingShapeId()
-				const nextValue = new Map(prevValue)
-				let isDirty = false
-				const checkShapeCullingInfo = (id: TLShapeId) => {
-					const ci = this._getShapeCullingInfo(
-						id,
-						selectedShapeIds,
-						editingId,
-						renderingBoundsExpanded
-					)
-					if (ci.isCulled && !prevValue.has(id)) {
-						nextValue.set(id, ci.maskedPageBounds)
-						isDirty = true
-					}
-				}
-				for (const changes of diff) {
-					for (const record of Object.values(changes.added)) {
-						if (isShape(record)) {
-							checkShapeCullingInfo(record.id)
-						}
-					}
-
-					for (const [_from, to] of Object.values(changes.updated)) {
-						if (isShape(to)) {
-							checkShapeCullingInfo(to.id)
-						}
-					}
-					for (const id of Object.keys(changes.removed)) {
-						if (isShapeId(id)) {
-							const hasBeenDeleted = nextValue.delete(id)
-							if (hasBeenDeleted) {
-								isDirty = true
-							}
-						}
-					}
-				}
-
-				return isDirty ? nextValue : prevValue
-			}
-		)
+	getCulledShapes(): Set<TLShapeId> {
+		return this._culledShapes.get()
 	}
 
+	/**
+	 * A cache of parents to children.
+	 *
+	 * @internal
+	 */
+	private readonly _culledShapes: ReturnType<typeof culledShapes>
+
 	/**
 	 * The bounds of the current page (the common bounds of all of the shapes on the page).
 	 *
diff --git a/packages/editor/src/lib/editor/derivations/culledShapes.ts b/packages/editor/src/lib/editor/derivations/culledShapes.ts
new file mode 100644
index 000000000..ae7224aef
--- /dev/null
+++ b/packages/editor/src/lib/editor/derivations/culledShapes.ts
@@ -0,0 +1,101 @@
+import { computed, isUninitialized, RESET_VALUE } from '@tldraw/state'
+import { isShape, isShapeId, TLPageId, TLShapeId } from '@tldraw/tlschema'
+import { Box } from '../../primitives/Box'
+import { Editor } from '../Editor'
+
+export function culledShapes(editor: Editor) {
+	function getShapeCullingInfo(
+		id: TLShapeId,
+		selectedShapeIds: TLShapeId[],
+		editingId: TLShapeId | null,
+		viewportPageBounds: Box
+	): boolean {
+		if (editingId === id) return false
+		const maskedPageBounds = editor.getShapeMaskedPageBounds(id)
+		// if the shape is fully outside of its parent's clipping bounds...
+		if (maskedPageBounds === undefined) return true
+		// We don't cull selected shapes
+		if (selectedShapeIds.includes(id)) return false
+		// the shape is outside of the expanded viewport bounds...
+		return !viewportPageBounds.includes(maskedPageBounds)
+	}
+
+	const isCullingOffScreenShapes = Number.isFinite(editor.renderingBoundsMargin)
+
+	const shapeHistory = editor.store.query.filterHistory('shape')
+	let lastPageId: TLPageId | null = null
+	let prevBounds: Box
+
+	function fromScratch(editor: Editor): Set<TLShapeId> {
+		const bounds = editor.getViewportPageBounds()
+		prevBounds = bounds.clone()
+		lastPageId = editor.getCurrentPageId()
+		const shapes = editor.getCurrentPageShapeIds()
+		const culledShapes = new Set<TLShapeId>()
+		const selectedShapeIds = editor.getSelectedShapeIds()
+		const editingId = editor.getEditingShapeId()
+		shapes.forEach((id) => {
+			if (getShapeCullingInfo(id, selectedShapeIds, editingId, bounds)) {
+				culledShapes.add(id)
+			}
+		})
+		return culledShapes
+	}
+
+	return computed<Set<TLShapeId>>('getCulledShapes', (prevValue, lastComputedEpoch) => {
+		if (!isCullingOffScreenShapes) return new Set<TLShapeId>()
+
+		if (isUninitialized(prevValue)) {
+			return fromScratch(editor)
+		}
+		const diff = shapeHistory.getDiffSince(lastComputedEpoch)
+
+		if (diff === RESET_VALUE) {
+			return fromScratch(editor)
+		}
+
+		const currentPageId = editor.getCurrentPageId()
+		if (lastPageId !== currentPageId) {
+			return fromScratch(editor)
+		}
+		const renderingBoundsExpanded = editor.getViewportPageBounds()
+		if (!prevBounds || !renderingBoundsExpanded.equals(prevBounds)) {
+			return fromScratch(editor)
+		}
+		const selectedShapeIds = editor.getSelectedShapeIds()
+		const editingId = editor.getEditingShapeId()
+		const nextValue = new Set(prevValue)
+		let isDirty = false
+		const checkShapeCullingInfo = (id: TLShapeId) => {
+			if (
+				getShapeCullingInfo(id, selectedShapeIds, editingId, renderingBoundsExpanded) &&
+				!prevValue.has(id)
+			) {
+				nextValue.add(id)
+				isDirty = true
+			}
+		}
+		for (const changes of diff) {
+			for (const record of Object.values(changes.added)) {
+				if (isShape(record)) {
+					checkShapeCullingInfo(record.id)
+				}
+			}
+
+			for (const [_from, to] of Object.values(changes.updated)) {
+				if (isShape(to)) {
+					checkShapeCullingInfo(to.id)
+				}
+			}
+			for (const id of Object.keys(changes.removed)) {
+				if (isShapeId(id)) {
+					if (nextValue.delete(id)) {
+						isDirty = true
+					}
+				}
+			}
+		}
+
+		return isDirty ? nextValue : prevValue
+	})
+}