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With DLSS-G, Reflex's sleep held each frame's start with no limit while the game's pacer still held the limit on the present thread and at the window image's acquire (A-16, P-16): the pacer's wait came after the picture was drawn, so the pad was read up to a period before the picture left, on top of Reflex's own wait for the GPU. vk_dlssg.c vk_dlssg_pace, on the presenting guest thread in nvnQueuePresentTexture, asks dlssg_pace.h which limit Reflex should hold and stores it; vk_dlssg_frame on the present thread hands a changed limit to Streamline before its present (reflex_apply, under the present lock, which keeps Streamline's options calls on one thread at a time), as does each new swapchain, which has neither mode nor limit. GfxBackend.frame_paced now returns the period the pacer still holds: vk_backend.c vk_be_frame_paced gives the game's ceiling (frame_step_ceiling_ns, 240) while Reflex holds the limit, 0 where a driver's low latency holds it (vk_lowlat_pace, unchanged), else the period; during a movie the back ends get 0 and the pacer keeps the movie's period and catch-up slots as before. The pacer takes the limit back before the first host present, after 200 ms without one, with a DLL older than nx2sl_reflex2 (one log line at start), for a limit Streamline refused, and for the run when the frames show Reflex does not hold it; the "frame rate:" lines name who holds it, the "dlssg: present N" line counts the frame starts Reflex held, and Reflex's sleep now counts as pacing (perf_end_any, on whichever thread acquires). No wait is added on a drawing thread: the limiter's wait moves from the acquire's sleep_until and the present thread's slot to Reflex's sleep a few lines later in the same acquire, and the present thread's options call returns at once. docs/architecture.md names Reflex as a limiter. Not reproduced before the change (no RTX 40 or 50 here); vk_dlssg.c, vk_backend.c and nvn_api_obj.c compile clean with the dev build's flags, and dlssg_pace_check, fg_reset_check and frame_step_check pass. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>