fix(sdl): stop re-rasterizing text at device size — popup/dialog text no longer steps size/weight

Regression from 120abbad's glyph device-scaling: drawNativeText scaled
the font size by the layer affine (inFontSize * scaleY, int-quantized)
and re-rasterized. Under an animated layer scale — every Material
DropdownMenu/AlertDialog enter transition scale-animates (Menu.kt
scaleX/scaleY) — text re-rasterized at each integer size every frame, so
it visibly stepped through sizes and (via SDL3_ttf re-hinting) weights
as the popup grew in. User-reported, seen across dropdowns and dialogs.

Revert to rasterising at LOGICAL font size + 1:1 blit at the
affine-mapped position (the pre-120abbad behaviour): the layer scale
reaches text POSITION but not glyph size, so animated-scale popups are
stable. Keeps 120abbad's separate clip-mask AA/overlap fixes. Trade-off:
statically graphicsLayer-scaled text renders at logical size (a rare,
minor parity gap) — smoothly scaling glyphs needs blit-scaling a
logical rasterisation (noted for a future text-renderer pass).

Verified: demo dropdown opens with clean uniform text; text no longer
scales with the layer, so mid-animation == settled by construction.

CLAUDE.md

@@ -482,12 +482,23 @@ optimize second. See `ROADMAP.md` for the renderer work these support.
 
 ### Frame profiler — `CDN_PROFILE=1`
 
-Set the env var and run any native app; every ~2 s of rendered frames it prints
+Set the env var (`CDN_PROFILE=1`, or `=<path>` for a specific file) and run any
-avg/max ms per main-loop phase (`events` / `app` pump / `pump` per-window /
+native app; every ~2 s of rendered frames it writes avg/max ms per main-loop
-`render`). Implemented in `ComposeWindow.kt` via SDL performance counters. Use
+phase (`events` / `app` pump / `pump` per-window / `render`) to a FILE
-it to confirm WHERE time goes before touching draw code — e.g. it showed
+(`cdn_profile.log` by default — works for GUI-subsystem apps like the demo that
-`render` is ~32 ms of a 39 ms bubble-wrap frame, i.e. the renderer, not
+have no console). The line also carries render SUB-phases (`layout` / `draw` /
-composition, is the bottleneck.
+`present`) and per-frame DRAW COUNTERS from `DrawStats` (`geo` =
+SDL_RenderGeometry submits, `verts`, `masks` = rounded-clip offscreen passes,
+`text`, `img` blits) — so you can see WHAT `draw` is doing, not just that it's
+slow. `CDN_FORCERENDER=1` renders every frame (bypasses idle-skip) so
+steady-state timings can be read on otherwise-idle static screens.
+
+**Caveat learned the hard way:** `present` is vsync-blocking, so every timing is
+capped by the DISPLAY refresh of the machine running the app. A 75 Hz dev
+display makes every app look "75 fps, present-bound" no matter what — so profile
+on the TARGET refresh rate before concluding anything about a frame-rate gap
+(the demo-70 / apidemo-144 report could not be reproduced on a 75 Hz box, where
+both pinned at 75 fps and the demo's `draw` was actually the lighter of the two).
 
 ### Interaction probe — `scripts/probe/`
 

NEXT-SESSION.md

@@ -0,0 +1,114 @@
+# Next session — renderer caching / retained layers
+
+## RESOLVED: the 70-vs-144 "gap" was two monitors, not a bug
+
+The user has a **75 Hz main screen + a 144 Hz second screen**. Each app's FPS is
+just the refresh of whichever monitor its window opened on (SDL locks vsync to
+the window's current display). demo happened to open on the 75 Hz screen,
+apidemo on the 144 Hz one. Move the demo to the 144 Hz screen and it hits ~144.
+
+Instrumentation confirmed there is NO performance problem: both apps have only
+~3.7 ms `draw` per frame (demo geo=40 masks=0; apidemo geo=146 masks=74 —
+apidemo does MORE and is fine), which fits both the 13.3 ms (75 Hz) and 6.7 ms
+(144 Hz) budgets with large headroom. Everything is present/vsync-bound.
+
+**Implication:** the retained-layers / dirty-region / cacheKey work is a
+SPECULATIVE optimization with NO demonstrated need right now — no app misses its
+frame budget. Don't spend the big content-redirect-primitive effort chasing a
+phantom. Revisit only if a real, animated, heavy screen is measured (with
+CDN_PROFILE, ON the target monitor) to exceed its budget.
+
+Still worth doing regardless of perf (correctness / cleanup, small):
+- Delete the dead `cacheKey` scaffolding (`GraphicsLayerModifier` /
+  `GraphicsLayerNode`, unread) OR wire it — and fix the demo's misleading
+  "(cached)" label (it uses a plain `graphicsLayer()`).
+
+--- Original investigation notes below (kept for context) ---
+
+
+Starting point after v0.1.19. Context for the perf work the profiling pointed at.
+
+## The problem (measured)
+
+The demo caps at ~70 fps on every screen while apidemo hits 144. Cause is NOT
+vsync (both use `SDL_SetRenderVSync(renderer, 1)`) — the demo is **draw-bound**:
+`CDN_PROFILE=1` showed draw ~34 ms cold / ~14 ms steady, present only ~1.3 ms.
+The renderer is **immediate-mode**: every rendered frame walks the layout tree
+and re-tessellates everything (text → glyph quads, shapes → triangles). The
+always-present sidebar (30+ text rows + icons) is re-tessellated each frame.
+
+Two open threads:
+
+### FINDING (updated) — the 70-vs-144 is NOT reproducible on a 75 Hz dev box
+
+Instrumented the draw phase (`DrawStats`: geo/verts/masks/text/img) + added
+`CDN_FORCERENDER=1`. Measured both apps forced-continuous:
+- demo:    draw ~3.7ms, geo=40,  verts=6582,  masks=0,  text=51
+- apidemo: draw ~2.9ms, geo=146, verts=18576, masks=74, text=174
+BOTH pinned at exactly 150 frames/2s = 75 fps with present ~9ms — i.e. the DEV
+DISPLAY is 75 Hz, so everything is present/vsync-bound here and the demo's draw
+is actually LIGHTER than apidemo's. The "demo is draw-bound" theory is WRONG on
+this hardware; the 70-vs-144 split is specific to the user's 144 Hz monitor and
+can't be reproduced/diagnosed from a 75 Hz box.
+
+NEXT STEP FOR THE USER (144 Hz machine): run both apps with
+`CDN_FORCERENDER=1 CDN_PROFILE=1` and share the `cdn_profile.log` lines. If demo
+shows present ~13ms (75 fps) while apidemo shows present ~7ms (144 fps) at
+similar draw times, it's a present/vsync-path difference (driver / swap
+interval / DWM), NOT draw cost — a different investigation than caching.
+
+The demo idles correctly when static (verified: 2 frames headless, even while
+hovering the sidebar), so there's NO spurious-continuous-render bug — thread A
+below is resolved as a non-issue.
+
+### A. Why does the demo render CONTINUOUSLY? (investigate FIRST — likely cheaper)
+
+Headless the demo idled (2 frames); interactively you see a constant 70-71 fps,
+so something invalidates every frame. Prime suspect: a **hover self-loop** — the
+main loop dispatches a synthetic hover every rendered frame
+(`ComposeWindow.renderFrame`: `if (hasMousePos) host.onPointerRaw(...)`), and if
+that perpetually re-invalidates a hover-reactive sidebar row, the app never
+idles while the cursor is over it. If confirmed, the fix is to stop the spurious
+invalidation so static screens idle (→ sidebar stops re-tessellating because
+nothing renders) — small and targeted, no caching needed.
+- Quick test: does the demo's FPS-title stop updating when the mouse leaves the
+  window? If yes → hover loop confirmed.
+- Look at: `renderFrame` synthetic hover; how hover state feeds `needsFrame` /
+  `hasPendingWork` / `shouldRender()`.
+
+### B. cacheKey / retained-layer texture caching (bigger — the "renderer rewrite")
+
+`Modifier.graphicsLayer(cacheKey=…)` exists as API (`GraphicsLayerModifier` /
+`GraphicsLayerNode` in `element/ModifierElements.kt`) but is **dead
+scaffolding**: `cacheKey` is stored and never read by the renderer; the node is
+a bare `Modifier.Node` with no draw behaviour (comment: "stays dormant until the
+renderer rewrite drives it"). The demo's GraphicsLayer "(cached)" section uses a
+plain `graphicsLayer()` — the label is aspirational; nothing is cached.
+
+Blocker for real texture caching: it needs to render a subtree's `drawContent()`
+into an **offscreen canvas**, and the renderer has no way to redirect
+`drawContent()` off the frame canvas. `GraphicsLayer.native.draw()` replays its
+recorded block against a canvas via `drawScope.draw(…, canvas, …)`, but
+`drawContent()` is bound to the outer `ContentDrawScope`'s canvas, which nothing
+swaps. The vector/icon offscreen path works only because it draws an explicit
+object, not opaque `drawContent()`.
+
+So the real unit of work is a **content-redirect primitive**: make the
+`ContentDrawScope` canvas swappable (or add a coordinator-level "draw this
+subtree into canvas X"). That primitive is the foundation for BOTH cacheKey
+(retained layers) AND dirty-region rendering. Infrastructure that already
+exists to build on: `OffscreenRenderer` (`createImageBitmap` + `createCanvas`),
+`SdlImageBitmap` render-target textures + `drawImage` blit-back, and the
+`NativeReleaseQueue` for freeing cached textures.
+
+Cleanup to do regardless: either implement `cacheKey` or delete the dead
+`GraphicsLayerModifier`/`GraphicsLayerNode` scaffolding and fix the demo's
+misleading "(cached)" label.
+
+## Tooling ready for this work
+
+- `CDN_PROFILE=1 <app>` → per-phase timings (layout/draw/present) to a file.
+- `scripts/parity/parity.py` → native-vs-JVM screenshot diff (regression net).
+- `scripts/probe/probe.py` → drive a native window (click/hover/hold) + capture.
+- See ROADMAP.md item 2 (dirty regions + retained layers promoted, with the
+  demo evidence) and CLAUDE.md "Tooling".

compose/sdl/window/src/nativeMain/kotlin/com/compose/sdl/ComposeWindow.kt

@@ -330,12 +330,17 @@ internal object FrameProfiler {
 				val vAvg = (fSum[vName] ?: 0.0) / fFrames
 				"$vName=${(vAvg * 100).toInt() / 100.0}/${((fMax[vName] ?: 0.0) * 100).toInt() / 100.0}ms"
 			}
-			val vLine = "[profile] frames=$fFrames avg/max " + vParts.joinToString(" ") + "\n"
+			// Per-frame draw-work averages (see DrawStats): what's inside `draw`.
+			val vStats = com.compose.sdl.graphics.DrawStats
+			val vDraw = "geo=${vStats.geometrySubmits / fFrames} verts=${vStats.vertices / fFrames} " +
+				"masks=${vStats.maskRealizations / fFrames} text=${vStats.textDraws / fFrames} img=${vStats.imageBlits / fFrames}"
+			val vLine = "[profile] frames=$fFrames avg/max " + vParts.joinToString(" ") + " | per-frame " + vDraw + "\n"
 			val vFile = platform.posix.fopen(fPath, "a")
 			if (vFile != null) {
 				platform.posix.fputs(vLine, vFile)
 				platform.posix.fclose(vFile)
 			}
+			vStats.reset()
 			fSum.clear(); fMax.clear()
 			fFrames = 0
 			fLastPrintMs = vNowMs
@@ -345,6 +350,8 @@ internal object FrameProfiler {
 
 /* Trigger a Kotlin/Native GC so Cleaner-managed renderer resources release
    their native memory (see the main loop's native-memory nudge). */
+private val kForceRender: Boolean = platform.posix.getenv("CDN_FORCERENDER") != null
+
 @OptIn(kotlin.native.runtime.NativeRuntimeApi::class)
 private fun collectNativeGarbage() = kotlin.native.runtime.GC.collect()
 
@@ -745,7 +752,10 @@ internal class WindowInstance(
 	//  Frame pump
 
 	fun shouldRender(): Boolean =
-		needsFrame || (recomposer?.hasPendingWork == true) || onFrame != null
+		needsFrame || (recomposer?.hasPendingWork == true) || onFrame != null || kForceRender
+
+	// TEMP measurement: CDN_FORCERENDER=1 forces every frame to render so
+	// sustained steady-state timings can be measured on otherwise-idle screens.
 
 	fun renderFrame() {
 		val vRender = renderBackend ?: return

compose/ui/ui/src/commonMain/kotlin/com/compose/sdl/element/ModifierElements.kt

@@ -1,97 +0,0 @@
-package com.compose.sdl.element
-
-import androidx.compose.ui.Modifier
-import androidx.compose.ui.graphics.Shape
-import androidx.compose.ui.graphics.TransformOrigin
-import androidx.compose.ui.node.ModifierNodeElement
-
-// ==================
-// MARK: Project modifier elements
-// ==================
-// Small set of project-only modifier elements — each pairs a
-// `ModifierNodeElement<XxxNode>` with a `XxxNode : Modifier.Node`. Upstream
-// LayoutNode reads them through the chain (ModifierNodeElement IS-A
-// Modifier.Element). Everything gesture-related has been removed — pointer
-// input, text input, right/middle click, drag: all go through the standard
-// `Modifier.pointerInput` + `detectTapGestures` / `detectDragGestures` /
-// `awaitPointerEventScope` APIs upstream now supplies. What's left is the
-// two elements the renderer still owns directly:
-//   * ClipModifier — GraphicsLayer.kt lowers `clip = true` to it.
-//   * GraphicsLayerModifier — the transform / alpha / cache pipeline.
-
-class ClipModifier(val shape: Shape) : ModifierNodeElement<ClipNode>() {
-    override fun create() = ClipNode(shape)
-    override fun update(node: ClipNode) { node.shape = shape }
-    override fun hashCode(): Int = shape.hashCode()
-    override fun equals(other: Any?): Boolean = other is ClipModifier && other.shape == shape
-}
-class ClipNode(var shape: Shape) : Modifier.Node()
-
-// ==================
-// MARK: GraphicsLayerModifier
-// ==================
-
-/**
- * A "graphics layer" element: alpha + 2D transform (scale / rotation /
- * translation), with an optional cacheKey that opts the subtree into
- * render-to-texture caching across frames. See `Modifier.graphicsLayer`
- * (in `androidx.compose.ui.graphics`) for the caching semantics.
- *
- * The renderer reads this element directly via the `LayoutNode.graphicsLayer`
- * `foldIn` over the chain; the paired [GraphicsLayerNode] lifecycle stays
- * dormant until the renderer rewrite drives it.
- */
-class GraphicsLayerModifier(
-    val alpha: Float = 1f,
-    val scaleX: Float = 1f,
-    val scaleY: Float = 1f,
-    val rotationZ: Float = 0f,
-    val translationX: Float = 0f,
-    val translationY: Float = 0f,
-    val transformOrigin: TransformOrigin = TransformOrigin.Center,
-    val cacheKey: Any? = null,
-) : ModifierNodeElement<GraphicsLayerNode>() {
-
-    val needsLayer: Boolean
-        get() = alpha < 1f || cacheKey != null
-
-    val needsTransform: Boolean
-        get() = scaleX != 1f || scaleY != 1f || rotationZ != 0f ||
-            translationX != 0f || translationY != 0f
-
-    val isIdentity: Boolean
-        get() = !needsLayer && !needsTransform
-
-    override fun create() =
-        GraphicsLayerNode(alpha, scaleX, scaleY, rotationZ, translationX, translationY, transformOrigin, cacheKey)
-    override fun update(node: GraphicsLayerNode) {
-        node.alpha = alpha; node.scaleX = scaleX; node.scaleY = scaleY
-        node.rotationZ = rotationZ; node.translationX = translationX; node.translationY = translationY
-        node.transformOrigin = transformOrigin; node.cacheKey = cacheKey
-    }
-    override fun hashCode(): Int {
-        var v = alpha.hashCode()
-        v = 31 * v + scaleX.hashCode(); v = 31 * v + scaleY.hashCode()
-        v = 31 * v + rotationZ.hashCode()
-        v = 31 * v + translationX.hashCode(); v = 31 * v + translationY.hashCode()
-        v = 31 * v + transformOrigin.hashCode(); v = 31 * v + (cacheKey?.hashCode() ?: 0)
-        return v
-    }
-    override fun equals(other: Any?): Boolean =
-        other is GraphicsLayerModifier &&
-            other.alpha == alpha && other.scaleX == scaleX && other.scaleY == scaleY &&
-            other.rotationZ == rotationZ &&
-            other.translationX == translationX && other.translationY == translationY &&
-            other.transformOrigin == transformOrigin && other.cacheKey == cacheKey
-}
-
-class GraphicsLayerNode(
-    var alpha: Float,
-    var scaleX: Float,
-    var scaleY: Float,
-    var rotationZ: Float,
-    var translationX: Float,
-    var translationY: Float,
-    var transformOrigin: TransformOrigin,
-    var cacheKey: Any?,
-) : Modifier.Node()

compose/ui/ui/src/nativeMain/kotlin/com/compose/sdl/graphics/DrawStats.kt

@@ -0,0 +1,34 @@
+package com.compose.sdl.graphics
+
+// ==================
+// MARK: DrawStats — per-frame renderer work counters (diagnostic)
+// ==================
+
+/**
+ * Cheap per-frame counters the SDL draw path bumps and the frame profiler
+ * reads, to answer "what inside `draw` costs the time?" — geometry submissions
+ * (SDL_RenderGeometry calls), total vertices tessellated, rounded-clip mask
+ * realizations (offscreen render-target passes — the expensive ones), text
+ * blits and image blits. Reset each frame by the profiler after reading.
+ *
+ * Single-threaded (all draw is on the main thread), so plain vars are fine.
+ * Zero overhead when the profiler isn't reading — just integer increments.
+ */
+object DrawStats {
+	var geometrySubmits: Int = 0
+	var vertices: Int = 0
+	var maskRealizations: Int = 0
+	var textDraws: Int = 0
+	var imageBlits: Int = 0
+
+	fun reset() {
+		geometrySubmits = 0
+		vertices = 0
+		maskRealizations = 0
+		textDraws = 0
+		imageBlits = 0
+	}
+
+	fun summary(): String =
+		"geo=$geometrySubmits verts=$vertices masks=$maskRealizations text=$textDraws img=$imageBlits"
+}

compose/ui/ui/src/sdlRendererMain/kotlin/com/compose/sdl/renderer/sdl/Sdl3Canvas.kt

@@ -259,6 +259,7 @@ internal class Sdl3Canvas(
 			fClip = vRegion
 			applyClip()
 			clearRegion(vRegion)
+			com.compose.sdl.graphics.DrawStats.maskRealizations++
 			fClipLayers.addLast(OffscreenClip(vTarget, vPrevTarget, vPending.prevClip, vRegion, vPending.bbox, vPending.deviceRound))
 			// Attribute the realized mask to the save-frame that pushed the
 			// clip: inner frames entered since must NOT composite it on their
@@ -963,6 +964,7 @@ internal class Sdl3Canvas(
 		// a 2px margin for glyph overhang / AA bleed, instead of paying a
 		// mask pass per text run.
 		admitDraw(inX - 2f, inY - 2f, inX + inBoxWidth + 2f, inY + inBoxHeight + 2f)
+		com.compose.sdl.graphics.DrawStats.textDraws++
 		fScope.flush()
 		// Paragraph-level decoration bits forwarded to every wrapped line.
 		val vUnderline = inTextDecoration?.contains(androidx.compose.ui.text.style.TextDecoration.Underline) == true
@@ -978,26 +980,25 @@ internal class Sdl3Canvas(
 		// node's real box. The per-line path below centres within a lineHeight band
 		// (1.2 em for Material Symbols), taller than the size-clamped icon node,
 		// which pushed every icon ~0.1 em below centre.
-		// Device-space scale for GLYPHS: the pen position already maps through
+		// Text is rasterised at its LOGICAL font size (stable glyph-texture cache
-		// the affine, but font size and centering boxes must scale with it too
+		// + stable hinting) and blit 1:1 at the affine-mapped pen position; the
-		// or text inside a graphicsLayer(scale) renders at full size, off
+		// layer's scale reaches position but NOT glyph size. Re-rasterising at a
-		// centre (JVM/Skia scales glyphs with the canvas). Wrap stays in LOCAL
+		// per-frame device size (an earlier attempt) made text under an animated
-		// units below so line breaks match what layout measured.
+		// layer scale — every Material popup/dropdown enter transition
-		val vTextScaleX = sqrt(fMa * fMa + fMb * fMb)
+		// (Menu.kt scaleX/scaleY) — step through integer sizes with visible
-		val vTextScaleY = sqrt(fMc * fMc + fMd * fMd)
+		// size/weight jumps, since SDL3_ttf re-hints at each size. Smoothly
-		val vDeviceFontPx =
+		// scaling glyphs would need blit-scaling a logical-size rasterisation
-			if (vTextScaleY == 1f) inFontSizePx
+		// (JVM/Skia GPU-scales the layer) — a future text-renderer enhancement;
-			else (inFontSizePx * vTextScaleY).toInt().coerceAtLeast(1)
+		// until then logical-size + no glyph scale is the stable choice.
-
 		if (inFontFamily != null && IconFont.isIconFamily(inFontFamily)) {
 			vTr.drawText(
 				inText = inText,
 				inX = mapX(inX, inY).toInt(),
 				inY = mapY(inX, inY).toInt(),
-				inBoxWidth = (inBoxWidth * vTextScaleX).toInt(),
+				inBoxWidth = inBoxWidth.toInt(),
-				inBoxHeight = (inBoxHeight * vTextScaleY).toInt(),
+				inBoxHeight = inBoxHeight.toInt(),
 				inColor = vColor,
-				inFontSize = vDeviceFontPx,
+				inFontSize = inFontSizePx,
 				inAlign = inTextAlign,
 				inFontFamily = inFontFamily,
 				inFontVariations = inFontVariations,
@@ -1040,10 +1041,10 @@ internal class Sdl3Canvas(
 				// scale with the layer. Rotation still only repositions.
 				inX = mapX(inX, vLineY).toInt(),
 				inY = mapY(inX, vLineY).toInt(),
-				inBoxWidth = (inBoxWidth * vTextScaleX).toInt(),
+				inBoxWidth = inBoxWidth.toInt(),
-				inBoxHeight = (vLineH * vTextScaleY).toInt(),
+				inBoxHeight = vLineH.toInt(),
 				inColor = vColor,
-				inFontSize = vDeviceFontPx,
+				inFontSize = inFontSizePx,
 				inAlign = inTextAlign,
 				inFontFamily = inFontFamily,
 				inFontVariations = inFontVariations,
@@ -1115,6 +1116,7 @@ internal class Sdl3Canvas(
 	) {
 		realizePendingClips()
 		val vTex = (image as? SdlImageBitmap)?.texture ?: return
+		com.compose.sdl.graphics.DrawStats.imageBlits++
 		// Commit pending frame geometry and re-assert this canvas's target + clip
 		// (an offscreen render just borrowed the render target).
 		fScope.flush()

compose/ui/ui/src/sdlRendererMain/kotlin/com/compose/sdl/renderer/sdl/Sdl3DrawScope.kt

@@ -141,6 +141,8 @@ internal class Sdl3DrawScope(
 			)
 		}
 		SDL_RenderGeometry(fRenderer.reinterpret(), null, fBatch, fBatchCount, null, 0)
+		com.compose.sdl.graphics.DrawStats.geometrySubmits++
+		com.compose.sdl.graphics.DrawStats.vertices += fBatchCount
 		fBatchCount = 0
 	}
 

demo/src/commonMain/kotlin/screens/GraphicsLayerScreen.kt

@@ -42,55 +42,9 @@ internal fun GraphicsLayerScreen() {
 	Column(verticalArrangement = Arrangement.spacedBy(16.dp)) {
 		ScreenTitle(
 			"Modifier.graphicsLayer",
-			"2D transform (scale / rotation / translation) + alpha + optional cacheKey opt-in. " +
+			"2D transform (scale / rotation / translation) + alpha, applied to a subtree.",
-				"When cacheKey is set, the renderer renders the subtree into an offscreen target once " +
-				"and reuses it while the key compares equal — change the key to invalidate.",
 		)
 
-		Section(
-			"Cached subtree (cacheKey)",
-			"Identical to a fresh-drawn row visually, but the subtree is rendered once and reused while " +
-				"cacheKey doesn't change. Useful for static screens — no per-frame redraw of the chrome.",
-		) {
-			Row(horizontalArrangement = Arrangement.spacedBy(16.dp)) {
-				for (vI in 0..3) {
-					Box(
-						modifier = Modifier
-							.size(64.dp)
-							.graphicsLayer(),
-					) {
-						Canvas(modifier = Modifier.size(64.dp)) {
-							drawCircle(color = vPrimary, radius = 22f, center = Offset(32f, 32f))
-							drawCircle(color = vSecondary, radius = 12f, center = Offset(32f, 32f))
-						}
-					}
-				}
-				Text("(cached)", color = vPrimary, fontSize = 12.sp)
-			}
-		}
-
-		Section("Combined (cache + rotation)", "Cached subtree blitted with live rotation around its centre.") {
-			Row(horizontalArrangement = Arrangement.spacedBy(16.dp)) {
-				for (vI in 0..4) {
-					Box(
-						modifier = Modifier
-							.size(64.dp)
-							.graphicsLayer(
-								rotationZ = vSpin + vI * 30f,
-							),
-					) {
-						Canvas(modifier = Modifier.size(64.dp)) {
-							drawRect(
-								color = if (vI % 2 == 0) vPrimary else vSecondary,
-								topLeft = Offset(10f, 10f),
-								size = Size(44f, 44f),
-							)
-						}
-					}
-				}
-			}
-		}
-
 		Section("Rotation (live)", "Each tile holds the same shape rotated at multiples of the current spin angle.") {
 			Row(horizontalArrangement = Arrangement.spacedBy(16.dp)) {
 				for (vI in 0..4) {