diff --git a/MobileGL/MG_Remote/Server/ServerLoop.cpp b/MobileGL/MG_Remote/Server/ServerLoop.cpp
index af9098bc..08d5cfb4 100644
--- a/MobileGL/MG_Remote/Server/ServerLoop.cpp
+++ b/MobileGL/MG_Remote/Server/ServerLoop.cpp
@@ -28,6 +28,9 @@
 #include <condition_variable>
 #include <cstdlib>
 #include <cstdio>
+#if defined(__ANDROID__)
+#include <sys/system_properties.h>
+#endif
 #include <cstring>
 #include <mutex>
 #include <optional>
@@ -219,6 +222,23 @@ namespace MobileGL::MG_Remote::Server {
             return text != nullptr && text[0] != '\0';
         }
 
+        // The per-frame P65ServerFrame line is a measurement aid, not a log: at one line per present
+        // of every session it floods the device log (and pushes the lines tests grep for out of the
+        // ring). Opt in with MOBILEGL_SERVER_FRAME_STATS=1, or on Android the property
+        // debug.mobilegl.server_frame_stats=1; read once.
+        Bool ServerFrameStatsEnabled() {
+            static const Bool enabled = [] {
+                const char* value = std::getenv("MOBILEGL_SERVER_FRAME_STATS");
+#if defined(__ANDROID__)
+                char property[PROP_VALUE_MAX] = {};
+                if (value == nullptr && __system_property_get("debug.mobilegl.server_frame_stats", property) > 0)
+                    value = property;
+#endif
+                return value != nullptr && value[0] != ' ' && value[0] != '0';
+            }();
+            return enabled;
+        }
+
         void NameThisThread(const char* name) {
 #if defined(__linux__) || defined(__ANDROID__)
             pthread_setname_np(pthread_self(), name);
@@ -1099,23 +1119,25 @@ namespace MobileGL::MG_Remote::Server {
                         // reader spent WAITING for bytes, and one that is mostly recv calls with
                         // little read_ms is a reader that is copying.
                         const auto read = Transport::LinkMetricsTakeReadStats();
-                        MGLOG_I("P65ServerFrame frame=%llu records=%llu apply_ms=%.1f wall_ms=%.1f "
-                                "outside_ms=%.1f | read: %llu B in %llu recv(%llu reads) "
-                                "recv_ms=%.1f total_ms=%.1f (%.0f%% blocked, %.1f MB/s)",
-                                static_cast<unsigned long long>(++sFrameIndex),
-                                static_cast<unsigned long long>(sFrameRecords), applyMs, wallMs,
-                                wallMs - applyMs,
-                                static_cast<unsigned long long>(read.bytes),
-                                static_cast<unsigned long long>(read.calls),
-                                static_cast<unsigned long long>(read.reads),
-                                static_cast<double>(read.nsInRecv) / 1e6,
-                                static_cast<double>(read.nsTotal) / 1e6,
-                                read.nsTotal ? 100.0 * static_cast<double>(read.nsInRecv) /
-                                                   static_cast<double>(read.nsTotal)
-                                             : 0.0,
-                                read.nsTotal ? static_cast<double>(read.bytes) /
-                                                   (static_cast<double>(read.nsTotal) / 1e9) / 1e6
-                                             : 0.0);
+                        if (ServerFrameStatsEnabled()) {
+                            MGLOG_I("P65ServerFrame frame=%llu records=%llu apply_ms=%.1f wall_ms=%.1f "
+                                    "outside_ms=%.1f | read: %llu B in %llu recv(%llu reads) "
+                                    "recv_ms=%.1f total_ms=%.1f (%.0f%% blocked, %.1f MB/s)",
+                                    static_cast<unsigned long long>(++sFrameIndex),
+                                    static_cast<unsigned long long>(sFrameRecords), applyMs, wallMs,
+                                    wallMs - applyMs,
+                                    static_cast<unsigned long long>(read.bytes),
+                                    static_cast<unsigned long long>(read.calls),
+                                    static_cast<unsigned long long>(read.reads),
+                                    static_cast<double>(read.nsInRecv) / 1e6,
+                                    static_cast<double>(read.nsTotal) / 1e6,
+                                    read.nsTotal ? 100.0 * static_cast<double>(read.nsInRecv) /
+                                                       static_cast<double>(read.nsTotal)
+                                                 : 0.0,
+                                    read.nsTotal ? static_cast<double>(read.bytes) /
+                                                       (static_cast<double>(read.nsTotal) / 1e9) / 1e6
+                                                 : 0.0);
+                        }
                         sFrameWallStart = now;
                         sFrameApplyNs = 0;
                         sFrameRecords = 0;
diff --git a/README.md b/README.md
index fac07295..4da0ac05 100644
--- a/README.md
+++ b/README.md
@@ -173,6 +173,7 @@ MobileGL supports runtime configuration via environment variables.
 | `MOBILEGL_ESPRYT_AVOID_SAMPLER_MIPMAP_MIN_FILTER` | Avoid sampler mipmap minification filters. | `0`, `1` | `0` |
 | `MOBILEGL_COHERENT_AS_FLUSH` | Treat persistent `GL_MAP_FLUSH_EXPLICIT_BIT` maps as coherent (app-compat for engines like Flywheel that never flush them). | `0`, `1` | `0` |
 | `MOBILEGL_ESPRYT_FORCE_DS_READBACK_EMULATION` | Always emulate depth/stencil `glReadPixels`/`glGetTexImage` by shader sampling on Espryt, instead of using the driver's own depth/stencil readback where it has one. | `0`, `1` | `0` |
+| `MOBILEGL_SERVER_FRAME_STATS` | Log one `P65ServerFrame` timing line per presented frame on the server (apply vs. wall time, socket read rate). On Android also `debug.mobilegl.server_frame_stats`. | `0`, `1` | `0` |
 | `VK_ICD_FILENAMES`      | Select the Vulkan ICD used by the Vulkan loader. | Path to an ICD JSON file             | Loader default |
 
 ## License
diff --git a/tools/device_bench/disagg/README.md b/tools/device_bench/disagg/README.md
index 10982057..06e8b2ef 100644
--- a/tools/device_bench/disagg/README.md
+++ b/tools/device_bench/disagg/README.md
@@ -95,7 +95,7 @@ P6.5 link numbers: `docs/Disaggregated/notes/p12/CROSSHOST-ACCEPTANCE.md`.
 ## netbench.sh — Wi-Fi TCP throughput baseline
 
 **Understates the link**: the `toybox nc` sink capped at 18-22 MiB/s while the render server
-read 52 MB/s on the same Wi-Fi. Use the server's `P65ServerFrame` read rate as the throughput number.
+read 52 MB/s on the same Wi-Fi. Use the server's `P65ServerFrame` read rate as the throughput number (enable it with `MOBILEGL_SERVER_FRAME_STATS=1` or `setprop debug.mobilegl.server_frame_stats 1`; it is off by default).
 
 WSL -> phone bulk transfer over `toybox nc` sink, 3 reps; refuses to run
 unless `tcp_path_check.sh` passes. The `nc` listener must keep stdin open or it
