diff --git a/mongoose.h b/mongoose.h
index 516cc37edc..996c51f103 100644
--- a/mongoose.h
+++ b/mongoose.h
@@ -802,7 +802,7 @@ struct timeval {
 #endif
 
 #ifndef MG_IO_SIZE
-#define MG_IO_SIZE 256  // Granularity of the send/recv IO buffer growth
+#define MG_IO_SIZE 512  // Granularity of the send/recv IO buffer growth
 #endif
 
 #ifndef MG_MAX_RECV_SIZE
@@ -3195,14 +3195,22 @@ struct mg_tcpip_driver_tms570_data {
 
 
 
-#if MG_ENABLE_TCPIP && defined(MG_ENABLE_DRIVER_W5500) && MG_ENABLE_DRIVER_W5500
-
-#endif
-
-
-#if MG_ENABLE_TCPIP && defined(MG_ENABLE_DRIVER_XMC7) && MG_ENABLE_DRIVER_XMC7
+#if MG_ENABLE_TCPIP && defined(MG_ENABLE_DRIVER_XMC) && MG_ENABLE_DRIVER_XMC
 
-struct mg_tcpip_driver_xmc7_data {
+struct mg_tcpip_driver_xmc_data {
+  // 13.2.8.1 Station Management Functions
+  // MDC clock divider (). MDC clock is derived from ETH MAC clock
+  // It must not exceed 2.5MHz
+  // ETH Clock range  DIVIDER       mdc_cr VALUE
+  // --------------------------------------------
+  //                                     -1  <-- tell driver to guess the value
+  // 60-100 MHz       ETH Clock/42        0
+  // 100-150 MHz      ETH Clock/62        1
+  // 20-35 MHz        ETH Clock/16        2
+  // 35-60 MHz        ETH Clock/26        3
+  // 150-250 MHz      ETH Clock/102       4
+  // 250-300 MHz      ETH Clock/124       5
+  // 110, 111 Reserved
   int mdc_cr;  // Valid values: -1, 0, 1, 2, 3, 4, 5
   uint8_t phy_addr;
 };
@@ -3212,45 +3220,31 @@ struct mg_tcpip_driver_xmc7_data {
 #endif
 
 #ifndef MG_DRIVER_MDC_CR
-#define MG_DRIVER_MDC_CR 3
+#define MG_DRIVER_MDC_CR 4
 #endif
 
 #define MG_TCPIP_DRIVER_INIT(mgr)                                 \
   do {                                                            \
-    static struct mg_tcpip_driver_xmc7_data driver_data_;       \
+    static struct mg_tcpip_driver_xmc_data driver_data_;       \
     static struct mg_tcpip_if mif_;                               \
     driver_data_.mdc_cr = MG_DRIVER_MDC_CR;                       \
     driver_data_.phy_addr = MG_TCPIP_PHY_ADDR;                    \
     mif_.ip = MG_TCPIP_IP;                                        \
     mif_.mask = MG_TCPIP_MASK;                                    \
     mif_.gw = MG_TCPIP_GW;                                        \
-    mif_.driver = &mg_tcpip_driver_xmc7;                        \
+    mif_.driver = &mg_tcpip_driver_xmc;                        \
     mif_.driver_data = &driver_data_;                             \
     MG_SET_MAC_ADDRESS(mif_.mac);                                 \
     mg_tcpip_init(mgr, &mif_);                                    \
-    MG_INFO(("Driver: xmc7, MAC: %M", mg_print_mac, mif_.mac)); \
+    MG_INFO(("Driver: xmc, MAC: %M", mg_print_mac, mif_.mac)); \
   } while (0)
 
 #endif
 
 
+#if MG_ENABLE_TCPIP && defined(MG_ENABLE_DRIVER_XMC7) && MG_ENABLE_DRIVER_XMC7
 
-#if MG_ENABLE_TCPIP && defined(MG_ENABLE_DRIVER_XMC) && MG_ENABLE_DRIVER_XMC
-
-struct mg_tcpip_driver_xmc_data {
-  // 13.2.8.1 Station Management Functions
-  // MDC clock divider (). MDC clock is derived from ETH MAC clock
-  // It must not exceed 2.5MHz
-  // ETH Clock range  DIVIDER       mdc_cr VALUE
-  // --------------------------------------------
-  //                                     -1  <-- tell driver to guess the value
-  // 60-100 MHz       ETH Clock/42        0
-  // 100-150 MHz      ETH Clock/62        1
-  // 20-35 MHz        ETH Clock/16        2
-  // 35-60 MHz        ETH Clock/26        3
-  // 150-250 MHz      ETH Clock/102       4
-  // 250-300 MHz      ETH Clock/124       5
-  // 110, 111 Reserved
+struct mg_tcpip_driver_xmc7_data {
   int mdc_cr;  // Valid values: -1, 0, 1, 2, 3, 4, 5
   uint8_t phy_addr;
 };
@@ -3260,27 +3254,28 @@ struct mg_tcpip_driver_xmc_data {
 #endif
 
 #ifndef MG_DRIVER_MDC_CR
-#define MG_DRIVER_MDC_CR 4
+#define MG_DRIVER_MDC_CR 3
 #endif
 
 #define MG_TCPIP_DRIVER_INIT(mgr)                                 \
   do {                                                            \
-    static struct mg_tcpip_driver_xmc_data driver_data_;       \
+    static struct mg_tcpip_driver_xmc7_data driver_data_;       \
     static struct mg_tcpip_if mif_;                               \
     driver_data_.mdc_cr = MG_DRIVER_MDC_CR;                       \
     driver_data_.phy_addr = MG_TCPIP_PHY_ADDR;                    \
     mif_.ip = MG_TCPIP_IP;                                        \
     mif_.mask = MG_TCPIP_MASK;                                    \
     mif_.gw = MG_TCPIP_GW;                                        \
-    mif_.driver = &mg_tcpip_driver_xmc;                        \
+    mif_.driver = &mg_tcpip_driver_xmc7;                        \
     mif_.driver_data = &driver_data_;                             \
     MG_SET_MAC_ADDRESS(mif_.mac);                                 \
     mg_tcpip_init(mgr, &mif_);                                    \
-    MG_INFO(("Driver: xmc, MAC: %M", mg_print_mac, mif_.mac)); \
+    MG_INFO(("Driver: xmc7, MAC: %M", mg_print_mac, mif_.mac)); \
   } while (0)
 
 #endif
 
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/src/config.h b/src/config.h
index 5a022051c9..5236da1760 100644
--- a/src/config.h
+++ b/src/config.h
@@ -82,7 +82,7 @@
 #endif
 
 #ifndef MG_IO_SIZE
-#define MG_IO_SIZE 256  // Granularity of the send/recv IO buffer growth
+#define MG_IO_SIZE 512  // Granularity of the send/recv IO buffer growth
 #endif
 
 #ifndef MG_MAX_RECV_SIZE