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Found 7 Skills
Analyze Android, Linux, and Chromium Perfetto traces with local trace_processor_shell evidence. Use for startup, scrolling or jank, input latency, ANR, CPU scheduling, memory or GC, Binder or IO, GPU or SurfaceFlinger, power or thermal, rendering-pipeline identification, trace capture guidance, scene reconstruction, and single- or multi-trace performance comparison.
Keep web animations inside the frame budget — animate composite-only properties, keep motion off the main thread when the page is busy, and find the cause when an animation drops frames. Covers the layout/paint/composite pipeline, cheaper property swaps, CSS vs WAAPI vs requestAnimationFrame, Framer Motion's hardware-accelerated path, React re-rendering per frame, inherited CSS variable recalculation, blur cost, and when `will-change` actually helps. Use when an animation is janky, choppy, stutters, or drops frames; when choosing which property to animate; when deciding between CSS and JS animation on performance grounds; or when reaching for `will-change` or GPU layers. For choosing easing, duration, or whether to animate at all use animate; for reviewing motion as a whole use review-animations.
Specializes in analyzing Lynx trace data to diagnose performance issues and provide actionable optimization strategies. Key Scenarios: - Loading Performance: Diagnosing slow startup metrics (FCP, FMP, TTI) and white screen issues. - Smoothness Analysis: Investigating root causes for scroll jank, frame drops, and interaction lag. - Regression Detection: Comparing traces to identify performance degradation or verify optimization gains between versions. - Pipeline Deep Dive: Pinpointing bottlenecks in specific rendering stages like Layout, Paint, JS execution, and background threads. - Native Module Analysis: Investigating performance issues related to native module calls.
Expert guide for WebGL API development including 3D graphics, shaders (GLSL), rendering pipeline, textures, buffers, performance optimization, and canvas rendering. Use when working with WebGL, 3D graphics, canvas rendering, shaders, GPU programming, or when user mentions WebGL, OpenGL ES, GLSL, vertex shaders, fragment shaders, texture mapping, or 3D web graphics.
3D game development principles. Rendering, shaders, physics, cameras.
Unity shaders, materials, and rendering pipelines (URP/HDRP/Built-in). PROACTIVELY activate for: (1) writing shaders in Shader Graph, HLSL, or ShaderLab, (2) URP and HDRP shader authoring, (3) custom render pipeline work (SRP), (4) lighting setup (baked vs realtime, lightmaps, Global Illumination), (5) post-processing stacks, (6) reflection probes and light probes, (7) custom render features and full-screen passes, (8) shader stripping and variant management, (9) compute shaders, (10) ray tracing in HDRP. Provides: Shader Graph templates, HLSL snippets, URP/HDRP differences, lighting setup recipes, render-feature examples, and shader-variant guidance.
Use when starting a frontend project, picking a stack, deciding where a feature belongs in the codebase, or diagnosing why a page is slow, janky, or visually unstable. Prevents premature bundling of small zero-build sites, animating non-compositor properties that drop frames, polyfilling features that are already Baseline Widely Available, and treating MDN as authoritative when MDN and the underlying specification disagree. Covers the four authoring layers of the web platform (markup, style, behavior, animation-timeline), spec lookup discipline across WHATWG, W3C, MDN, and web.dev, the browser rendering pipeline from DOM construction through compositing, build-step versus runtime trade-offs for evergreen-2026 browsers, and the compositor-only animation rule. Keywords: DOM, CSSOM, render tree, style computation, layout, reflow, paint, composite, compositor, will-change, contain, content-visibility, WHATWG, W3C, BCD, ESM, native modules, import maps, transform, opacity, filter, Baseline, evergreen, slow page, scroll stutter, jank, frame drop, dropped frames, layout shift, paint storm, forced sync layout, choppy animation, laggy scroll, blank screen, how do I start a frontend project, what frontend stack should I use, do I need a build step, what is the browser rendering pipeline, why is my animation laggy, where should this code live, which CSS property is fastest, can I ship without bundling.