Impeller was designed to solve the shader compilation jank that plagued Skia. However, migrating to the Impeller runtime often introduces a different class of rendering issues: flickering artifacts, aggressive battery drain, and frame drops during complex animations. These issues are most prevalent when using BackdropFilter (for glassmorphism), Opacity layers, or complex clipping within scrollable views. While shader compilation is gone, you are now hitting limits in GPU bandwidth and Render Pass management. The Root Cause: Render Pass Explosion To understand why your UI flickers, you must understand how Impeller renders a frame compared to Skia. Impeller functions using an Entity Component System (ECS) approach to rendering. It builds a tree of "Entities" which are then flattened into "Entity Passes." When you use BackdropFilter , Impeller cannot simply draw a sprite. It must: Flush the current render pass (write everything drawn s...
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