update

Author: RaananW

README.md

@@ -31,7 +31,9 @@ The `./src/scenes` directory contains a few examples of scenes that can be loade
 
 More and more scenes will be slowly added.
 
-## WebGPU? yes please!
+Note - the build process will be very slow if you keep all scenes for production. To speed up the build process, remove all scenes except for the one you want to build.
+
+## WebGPU? yes please
 
 Open the URL in a webgpu-enabled browser and add "?engine=webgpu" to the URL. If you want to add a different scene, add it as a query parameter: `http://localhost:8080/?scene=physicsWithAmmo&engine=webgpu`.