diff --git a/platformio.ini b/platformio.ini
index c4e1bfa..994eabf 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -79,6 +79,10 @@ build_flags =
 	${dualcore.build_flags}
 	-DCORE_DEBUG_LEVEL=3
 	--param=large-unit-insns=1000
+	-DSERIAL_BAUD=921600
+; The info logs hold up the task that logs for ~1ms a line at 921600, ~9ms at
+; 115200.  The ROM's boot banner stays at 115200, so it shows as garbage.
+monitor_speed = 921600
 
 [env:esp32s3]
 extends = esp32
diff --git a/src/SomfyController.ino b/src/SomfyController.ino
index 644980c..c6a2ff6 100644
--- a/src/SomfyController.ino
+++ b/src/SomfyController.ino
@@ -22,6 +22,10 @@
 
 static const char *TAG = "Main";
 #define LOOP_SLOW_MS 100
+// platformio.ini can set its own, along with a matching monitor_speed.
+#ifndef SERIAL_BAUD
+#define SERIAL_BAUD 115200
+#endif
 // How long an updated firmware has to run, and then have the network up, before
 // it is kept.  A reset before then rolls back to the previous firmware.
 #define OTA_PROVEN_MS 60000
@@ -67,7 +71,7 @@ void listDir(const char *dirname, uint8_t levels) {
 }
 
 void setup() {  
-  Serial.begin(115200);
+  Serial.begin(SERIAL_BAUD);
   ESP_LOGI(TAG, "Startup/Boot....");
   esp_core_dump_summary_t summary;
   if (esp_core_dump_get_summary(&summary) == ESP_OK) {