diff --git a/Marlin/Configuration_adv.h b/Marlin/Configuration_adv.h
index d3f9b87d82..aea4bb6037 100644
--- a/Marlin/Configuration_adv.h
+++ b/Marlin/Configuration_adv.h
@@ -2173,13 +2173,13 @@
 // For debug-echo: 128 bytes for the optimal speed.
 // Other output doesn't need to be that speedy.
 // :[0, 2, 4, 8, 16, 32, 64, 128, 256]
-#define TX_BUFFER_SIZE 256
+#define TX_BUFFER_SIZE 32
 
 // Host Receive Buffer Size
 // Without XON/XOFF flow control (see SERIAL_XON_XOFF below) 32 bytes should be enough.
 // To use flow control, set this buffer size to at least 1024 bytes.
 // :[0, 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024, 2048]
-#define RX_BUFFER_SIZE 2048
+#define RX_BUFFER_SIZE 32
 
 #if RX_BUFFER_SIZE >= 1024
   // Enable to have the controller send XON/XOFF control characters to
diff --git a/Marlin/src/pins/stm32f1/pins_MKS_ROBIN_NANO.h b/Marlin/src/pins/stm32f1/pins_MKS_ROBIN_NANO.h
index f5fc7c04e2..68827fe9ae 100644
--- a/Marlin/src/pins/stm32f1/pins_MKS_ROBIN_NANO.h
+++ b/Marlin/src/pins/stm32f1/pins_MKS_ROBIN_NANO.h
@@ -47,5 +47,5 @@
 #include "pins_MKS_ROBIN_NANO_common.h"
 
 #if HAS_TFT_LVGL_UI
-  #define BUF_SIZE_KB                       6
+  #define BUF_SIZE_KB                       12
 #endif