From 01fc3c3e7d7be5834de0d84e3de60584be92e7d3 Mon Sep 17 00:00:00 2001
From: Alejandro Alonso <alejandroalonsofernandez@gmail.com>
Date: Thu, 18 Jun 2026 18:33:10 +0200
Subject: [PATCH] :bug: Defer tile atlas composition to full frames only

---
 render-wasm/src/render.rs | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/render-wasm/src/render.rs b/render-wasm/src/render.rs
index f463e46240..950677fa70 100644
--- a/render-wasm/src/render.rs
+++ b/render-wasm/src/render.rs
@@ -2298,7 +2298,10 @@ impl RenderState {
         let frame_type =
             self.render_shape_tree_partial(base_object, tree, timestamp, allow_stop)?;
 
-        if !self.options.is_interactive_transform() {
+        // `draw_atlas` needs a snapshot of the tile atlas. Partial frames are not
+        // presented (only flushed), so defer composition to the final frame and
+        // avoid re-snapshotting up to 4096² on every rAF during async tile work.
+        if !self.options.is_interactive_transform() && matches!(frame_type, FrameType::Full) {
             self.surfaces.draw_tile_atlas_to_backbuffer(
                 &self.viewbox,
                 &self.tile_viewbox,