diff --git a/examples/wifi/iperf/sdkconfig.defaults.esp32s2 b/examples/wifi/iperf/sdkconfig.defaults.esp32s2
index 682ef13e59..a17196e0a1 100644
--- a/examples/wifi/iperf/sdkconfig.defaults.esp32s2
+++ b/examples/wifi/iperf/sdkconfig.defaults.esp32s2
@@ -1,19 +1,22 @@
 #
 # ESP32S2-specific
 #
-CONFIG_ESP32_WIFI_STATIC_RX_BUFFER_NUM=15
-CONFIG_ESP32_WIFI_DYNAMIC_RX_BUFFER_NUM=30
-CONFIG_ESP32_WIFI_DYNAMIC_TX_BUFFER_NUM=30
+CONFIG_ESP32_WIFI_STATIC_RX_BUFFER_NUM=8
+CONFIG_ESP32_WIFI_DYNAMIC_RX_BUFFER_NUM=24
+CONFIG_ESP32_WIFI_DYNAMIC_TX_BUFFER_NUM=24
 CONFIG_ESP32_WIFI_AMPDU_TX_ENABLED=y
 CONFIG_ESP32_WIFI_TX_BA_WIN=16
 CONFIG_ESP32_WIFI_AMPDU_RX_ENABLED=y
 CONFIG_ESP32_WIFI_RX_BA_WIN=16
 
-CONFIG_LWIP_TCP_SND_BUF_DEFAULT=28671
-CONFIG_LWIP_TCP_WND_DEFAULT=28671
-CONFIG_LWIP_TCP_RECVMBOX_SIZE=64
-CONFIG_LWIP_UDP_RECVMBOX_SIZE=64
-CONFIG_LWIP_TCPIP_RECVMBOX_SIZE=64
+CONFIG_LWIP_TCP_SND_BUF_DEFAULT=28000
+CONFIG_LWIP_TCP_WND_DEFAULT=28000
+CONFIG_LWIP_TCP_RECVMBOX_SIZE=32
+CONFIG_LWIP_UDP_RECVMBOX_SIZE=32
+CONFIG_LWIP_TCPIP_RECVMBOX_SIZE=32
+
+CONFIG_ESP32S2_DEFAULT_CPU_FREQ_240=y
+CONFIG_ESP32S2_DEFAULT_CPU_FREQ_MHZ=240
 
 CONFIG_ESPTOOLPY_FLASHMODE_QIO=y
 CONFIG_ESPTOOLPY_FLASHFREQ_80M=y