diff --git a/ports/psoc6/lwip_inc/lwipopts.h b/ports/psoc6/lwip_inc/lwipopts.h
index 1412e19c92fa..f25b7b215397 100644
--- a/ports/psoc6/lwip_inc/lwipopts.h
+++ b/ports/psoc6/lwip_inc/lwipopts.h
@@ -36,7 +36,7 @@
 #define MEM_ALIGNMENT                   (4)
 
 #define LWIP_RAW                        (1)
-
+#define NO_SYS                           0
 
 //
 // Enable IPV4 networking
@@ -147,8 +147,10 @@
  * TCP_SND_BUF: TCP sender buffer space (bytes).
  * To achieve good performance, this should be at least 2 * TCP_MSS.
  */
-#define TCP_SND_BUF                     (8 * TCP_MSS)
-
+#define TCP_SND_BUF                     (12 * TCP_MSS)
+#define TCP_WND                         (10 * TCP_MSS)
+#define LWIP_WND_SCALE                  1
+#define TCP_RCV_SCALE                   2
 /**
  * TCP_SND_QUEUELEN: TCP sender buffer space (pbufs). This must be at least
  * as much as (2 * TCP_SND_BUF/TCP_MSS) for things to work.
@@ -178,7 +180,7 @@
 #define DEFAULT_RAW_RECVMBOX_SIZE       (12)
 #define DEFAULT_UDP_RECVMBOX_SIZE       (12)
 #define DEFAULT_ACCEPTMBOX_SIZE         (8)
-
+#define TCP_OVERSIZE                    TCP_MSS
 /**
  * MEMP_NUM_UDP_PCB: the number of UDP protocol control blocks. One
  * per active UDP "connection".
@@ -212,7 +214,7 @@
 /**
  * PBUF_POOL_SIZE: the number of buffers in the pbuf pool.
  */
-#define PBUF_POOL_SIZE                  24
+#define PBUF_POOL_SIZE                  400
 
 /**
  * MEMP_NUM_NETBUF: the number of struct netbufs.
@@ -259,6 +261,8 @@
  */
 #define LWIP_NETIF_API                  1
 
+// #define TCP_LISTEN_BACKLOG              1
+
 #define LWIP_DNS                       (1)
 
 #define LWIP_NETIF_TX_SINGLE_PBUF      (0)