How to Reduce Lag in Your Scratch Project: *Custom Blocks: Use Make a Block and check "run without screen refresh" for procedural tasks (e.g., world generation, complex math). This executes code instantly, preventing screen redraws until the block finishes. *Optimize Clones: Avoid creating excessive clones. Use simple sprites, move them, and change costumes instead of cloning. Implement "object pooling" to reuse clones rather than deleting and recreating them. *Use Run without screen refresh carefully: While it boosts performance, never use it on loops that contain wait, forever, or wait until blocks, as this will cause intense lag. *Graphic Optimization: Use vector graphics instead of bitmap, as they render faster. Avoid using unnecessary graphical effects. *Simplify Code: Use if <key pressed> inside a forever loop instead of multiple "hat" blocks for movement, which can be laggy. *Reduce Editor Lag: If the Scratch editor is slow, create a blank sprite and place it at the front of your project to prevent the yellow highlight rendering from slowing down the browser. *Optimize Collision: Use simple shapes for hitboxes instead of complex, detailed costumes. *Use broadcast efficiently: For many sprites to react to a single event, use a single broadcast rather than having every sprite check for a condition in a forever loop. *Use TurboWarp: For finished projects that are too heavy for Scratch, use the TurboWarp emulator, which compiles Scratch code into JavaScript to run much faster.
