diff --git a/src/xrt/drivers/rift_s/rift_s_passthrough.c b/src/xrt/drivers/rift_s/rift_s_passthrough.c
index a7bc38587..8cebc67fd 100644
--- a/src/xrt/drivers/rift_s/rift_s_passthrough.c
+++ b/src/xrt/drivers/rift_s/rift_s_passthrough.c
@@ -12,6 +12,9 @@
 #define VIEW_SIZE 320
 #define MAX_AGE_NS (250 * U_TIME_1MS_IN_NS)
 
+// Owned by target_builder_rift_s.c via RIFT_S_LOG; declared here to avoid a heavy header.
+extern enum u_logging_level rift_s_log_level;
+
 struct rift_s_passthrough
 {
 	struct xrt_camera base;
@@ -141,14 +144,17 @@ rift_s_passthrough_push(struct xrt_camera *camera, struct xrt_frame *left, struc
 		uint64_t now = os_monotonic_get_ns();
 		if (now - p->last_diag_ns >= 5ULL * U_TIME_1S_IN_NS) {
 			p->last_diag_ns = now;
-			struct sensor_pixels pixels[2] = {measure_pixels(left), measure_pixels(right)};
-			double count = (double)left->width * left->height;
-			u_log(__FILE__, __LINE__, __func__, U_LOGGING_INFO,
-			      "Passthrough stereo sequence=%" PRIu64 " timestamp=%" PRIu64
-			      " left=%u,%u,%.3f right=%u,%u,%.3f rejected=%" PRIu64,
-			      left->source_sequence, left->timestamp, pixels[0].min, pixels[0].max,
-			      pixels[0].sum / count, pixels[1].min, pixels[1].max, pixels[1].sum / count,
-			      p->rejected_pairs);
+			// Periodic stereo health is debug-only; rejection warnings below still emit.
+			if (rift_s_log_level <= U_LOGGING_DEBUG) {
+				struct sensor_pixels pixels[2] = {measure_pixels(left), measure_pixels(right)};
+				double count = (double)left->width * left->height;
+				U_LOG_IFL_D(rift_s_log_level,
+				            "Passthrough stereo sequence=%" PRIu64 " timestamp=%" PRIu64
+				            " left=%u,%u,%.3f right=%u,%u,%.3f rejected=%" PRIu64,
+				            left->source_sequence, left->timestamp, pixels[0].min, pixels[0].max,
+				            pixels[0].sum / count, pixels[1].min, pixels[1].max,
+				            pixels[1].sum / count, p->rejected_pairs);
+			}
 		}
 		xrt_frame_reference(&p->raw[0], left);
 		xrt_frame_reference(&p->raw[1], right);
diff --git a/src/xrt/state_trackers/steamvr_drv/ovrd_driver.cpp b/src/xrt/state_trackers/steamvr_drv/ovrd_driver.cpp
index 46a3f37ca..d6ab810f9 100644
--- a/src/xrt/state_trackers/steamvr_drv/ovrd_driver.cpp
+++ b/src/xrt/state_trackers/steamvr_drv/ovrd_driver.cpp
@@ -68,6 +68,9 @@ DEBUG_GET_ONCE_BOOL_OPTION(emulate_index_controller, "STEAMVR_EMULATE_INDEX_CONT
 
 DEBUG_GET_ONCE_BOOL_OPTION(steamvr_bench, "MONADO_STEAMVR_BENCH", false)
 
+// Repeated unhandled SteamVR events are diagnostics only; keep them behind explicit opt-in.
+DEBUG_GET_ONCE_BOOL_OPTION(steamvr_event_debug, "MONADO_STEAMVR_EVENT_DEBUG", false)
+
 DEBUG_GET_ONCE_BOOL_OPTION(native_room_setup, "STEAMVR_NATIVE_ROOM_SETUP", true)
 DEBUG_GET_ONCE_BOOL_OPTION(native_room_setup_vrlink, "STEAMVR_NATIVE_ROOM_SETUP_VRLINK", false)
 
@@ -2103,7 +2106,10 @@ CServerDriver_Monado::RunFrame()
 		case vr::VREvent_Compositor_ChaperoneBoundsShown:
 		case vr::VREvent_Compositor_ChaperoneBoundsHidden: break;
 
-		default: ovrd_log("Unhandled Event: %d\n", event.eventType);
+		default:
+			if (debug_get_bool_option_steamvr_event_debug())
+				ovrd_log("Unhandled Event: %d\n", event.eventType);
+			break;
 		}
 	}
 }
diff --git a/src/xrt/state_trackers/steamvr_drv/ovrd_roomsetup_guard.cpp b/src/xrt/state_trackers/steamvr_drv/ovrd_roomsetup_guard.cpp
index 51bd8761b..3991a8026 100644
--- a/src/xrt/state_trackers/steamvr_drv/ovrd_roomsetup_guard.cpp
+++ b/src/xrt/state_trackers/steamvr_drv/ovrd_roomsetup_guard.cpp
@@ -211,9 +211,22 @@ static bool restore(vr::IVRChaperoneSetup &setup, const fs::path &path, const Sn
 	return read_file(path) == saved.file;
 }
 
+// Coordinate dump issues several public queries per call. Keep it behind an
+// explicit opt-in so default runs only pay for meaningful state changes/errors.
+static bool
+coords_debug_enabled()
+{
+	static const bool enabled = [] {
+		const char *value = getenv("MONADO_ROOMSETUP_COORDS_DEBUG");
+		return value && value[0] != '\0' && !(value[0] == '0' && value[1] == '\0');
+	}();
+	return enabled;
+}
+
 // Capture public coordinate state on transitions without changing calibration.
 static void log_coordinates(vr::IVRSystem &system, vr::IVRChaperoneSetup &setup, uint32_t event, uint32_t step)
 {
+	if (!coords_debug_enabled()) return;
 	auto raw_to_standing = system.GetRawZeroPoseToStandingAbsoluteTrackingPose();
 	auto seated_to_standing = system.GetSeatedZeroPoseToStandingAbsoluteTrackingPose();
 	vr::HmdMatrix34_t standing_to_raw{};