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Trace showed frame spikes from Three.js first-use costs mid-song: shader program compilation (getParameters/getProgramCacheKey) and lazy texture uploads (texSubImage2D) whenever a chord name, section banner, or fret label first appeared. - ren.compile(scene, cam) after initScene (pools already warmed by feedBack#226, board built, background mounted) so programs compile during the load spinner. - Pre-rasterise + GPU-upload (ren.initTexture) the deterministic txtMat entries: fret numbers 0-24 in the noteFret/fretRow/ghostFret combos the per-frame paths request. - Chart-dependent labels (chord template names, section names) prewarm once on the first draw() after each init, when bundle arrays are guaranteed populated. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>