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PyroWave's wavelet encode runs on the GPU's compute/shader cores, so a GPU-bound game starves it: submit spikes from ~2 ms to ~15 ms under a 95%+ game load and the stream fps collapses. NVENC is immune (separate encoder ASIC). Two levers to let the encode get scheduled ahead of the game's rendering: - Windows process GPU scheduling: D3DKMTSetProcessSchedulingPriorityClass, env PUNKTFUNK_GPU_PRIORITY = off|above-normal|high (default)|realtime. Best-effort, once per process, non-fatal on refusal (enc/windows/pyrowave.rs). - Global-priority Vulkan encode queue (Granite patch 0005): request a VK_KHR_global_priority queue (PYROWAVE_QUEUE_PRIORITY = off|high|realtime, default realtime), downgrading REALTIME→HIGH→none on NOT_PERMITTED so a refused class never regresses the encoder to HEVC. HONEST STATUS: on an RTX 4090 / Windows / WDDM neither moved the ~15 ms spikes — the graphics-vs-compute preemption granularity is the wall, not the priority level. Kept because both are correct, harmless (graceful fallback), and may help other GPUs/drivers. For a GPU-saturated game the working levers are reducing the encode's GPU cost (4:2:0/8-bit) or H.265; PyroWave holds full rate on the desktop and in games that leave the GPU headroom. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>