diff --git a/src/main.cpp b/src/main.cpp
index 99e8e59..0d1858a 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -5,6 +5,7 @@
 #include <Adafruit_SSD1306.h>
 #include <Adafruit_SPIDevice.h>
 #include <Adafruit_ILI9341.h>
+#include <dhcp.h>
 
 #include "config.h"
 #include "max31856.h"
@@ -88,59 +89,85 @@ int main() {
   };
   wizchip_setnetinfo(&netinfo);
   rgb_rainbow();
-  if (!w5500_rp_dhcp()) {
-    display.fillScreen(SSD1306_BLACK);
-    display.setCursor(64-24, 32-8);
-    display.print("fail");
-    display.display();
-    sleep_ms(1000);
-    return 1;
-  }
+  w5500_rp_dhcp();
 
   rgb_rainbow();
 
+  absolute_time_t time_read_temp = make_timeout_time_ms(0);
+  absolute_time_t time_read_ip = make_timeout_time_ms(10);
+  absolute_time_t time_update_display = make_timeout_time_ms(20);
+  absolute_time_t time_second = make_timeout_time_ms(0);
+
+  char cj_str[8] = {0, };
+  char tc_str[8] = {0, };
+  char ip[16] = {0, };
+
   while (true)
   {
-    char cj_str[8];
-    char tc_str[8];
-    char ip[16];
+    int64_t time = INT64_MIN;
+    int64_t time_max = INT64_MIN;
 
-    spi_set_format(SPI_MAX31856, SPI_MAX31856_BLOCK_SIZE, SPI_MAX31856_SPO, SPI_MAX31856_SPH, SPI_MAX31856_BIT_ORDER);
-    sleep_ms(5);
-    max31856_temp_t cj = max31856_get_cj_temp_c(&temp[0]);
-    snprintf(&cj_str[0], 8, "%i.%02uC", cj.i, cj.f);
-    max31856_temp_t tc = max31856_get_tc_temp_c(&temp[0]);
-    snprintf(&tc_str[0], 8, "%i.%02uC", tc.i, tc.f);
+    time = absolute_time_diff_us(time_read_temp, get_absolute_time());
+    time_max = MAX(time, time_max);
+    if (time >= 0) {
+      time_read_temp = delayed_by_ms(time_read_temp, 300);
+      spi_set_format(SPI_MAX31856, SPI_MAX31856_BLOCK_SIZE, SPI_MAX31856_SPO, SPI_MAX31856_SPH, SPI_MAX31856_BIT_ORDER);
+      max31856_temp_t cj = max31856_get_cj_temp_c(&temp[0]);
+      snprintf(&cj_str[0], 8, "%i.%02uC", cj.i, cj.f);
+      max31856_temp_t tc = max31856_get_tc_temp_c(&temp[0]);
+      snprintf(&tc_str[0], 8, "%i.%02uC", tc.i, tc.f);
 
-    netinfo = {
-      .mac={255, 255, 255, 255, 255, 255},
-      .ip={255, 255, 255, 255},
-      .sn={255, 255, 255, 255}, // subnet mask
-      .gw={255, 255, 255, 255},
-      .dns={255, 255, 255, 255},
-      .dhcp=NETINFO_STATIC
-    };
-    wizchip_getnetinfo(&netinfo);
-    w5500_rp_print_netinfo(netinfo);
-    snprintf(&ip[0], 16, "%u.%u.%u.%u", netinfo.ip[0], netinfo.ip[1], netinfo.ip[2], netinfo.ip[3]);
+      // printf("CJ temp: %s\n", &cj_str[0]);
+      // printf("TC temp: %s\n", &tc_str[0]);
+    }
 
-    // printf("CJ temp: %s\n", &cj_str[0]);
-    // printf("TC temp: %s\n", &tc_str[0]);
+    time = absolute_time_diff_us(time_read_temp, get_absolute_time());
+    time_max = MAX(time, time_max);
+    if (time >= 0) {
+      time_read_temp = delayed_by_ms(time_read_temp, 300);
+      netinfo = {
+        .mac={255, 255, 255, 255, 255, 255},
+        .ip={255, 255, 255, 255},
+        .sn={255, 255, 255, 255}, // subnet mask
+        .gw={255, 255, 255, 255},
+        .dns={255, 255, 255, 255},
+        .dhcp=NETINFO_STATIC
+      };
+      wizchip_getnetinfo(&netinfo);
+      // w5500_rp_print_netinfo(netinfo);
+      snprintf(&ip[0], 16, "%u.%u.%u.%u", netinfo.ip[0], netinfo.ip[1], netinfo.ip[2], netinfo.ip[3]);
+    }
 
-    spi_set_format(spi0, 8, SPI_CPOL_0, SPI_CPHA_0, SPI_MSB_FIRST);
-    sleep_ms(5);
-    display.fillScreen(SSD1306_BLACK);
-    display.setCursor(0, 0);
-    display.setTextSize(1);
-    display.println(&ip[0]);
-    display.setTextSize(2);
-    display.print("CJ ");
-    display.println(&cj_str[0]);
-    display.print("TC ");
-    display.println(&tc_str[0]);
-    display.display();
+    time = absolute_time_diff_us(time_update_display, get_absolute_time());
+    time_max = MAX(time, time_max);
+    if (time >= 0) {
+      time_update_display = delayed_by_ms(time_update_display, 300);
+      spi_set_format(spi0, 8, SPI_CPOL_0, SPI_CPHA_0, SPI_MSB_FIRST);
+      display.fillScreen(SSD1306_BLACK);
+      display.setCursor(0, 0);
+      display.setTextSize(1);
+      display.println(&ip[0]);
+      display.setTextSize(2);
+      display.print("CJ ");
+      display.println(&cj_str[0]);
+      display.print("TC ");
+      display.println(&tc_str[0]);
+      display.display();
+    }
 
-    sleep_ms(200);
+    DHCP_run();
+    time = absolute_time_diff_us(time_second, get_absolute_time());
+    time_max = MAX(time, time_max);
+    if (time >= 0) {
+      time_second = delayed_by_ms(time_second, 1000);
+      DHCP_time_handler();
+    }
+
+    if (time_max < -1000) {
+      sleep_us(-time_max);
+    } else if (time_max > 100) {
+      printf("%llius\n", time_max);
+    }
   }
   return 0;
 }
diff --git a/src/w5500_rp.cpp b/src/w5500_rp.cpp
index 7dc1ba2..8681f74 100644
--- a/src/w5500_rp.cpp
+++ b/src/w5500_rp.cpp
@@ -31,7 +31,6 @@ void w5500_rp_spi_read_burst(uint8_t *buffer, uint16_t size) {
 void w5500_rp_spi_cs_select() {
     spi_set_format(W5500_SPI_DRIVER, 8, SPI_CPOL_0, SPI_CPHA_0, SPI_MSB_FIRST);
     gpio_put(PIN_W5500_CS, 0);
-    printf("pling\n");
 }
 void w5500_rp_spi_cs_deselect() {
     gpio_put(PIN_W5500_CS, 1);
@@ -62,24 +61,7 @@ void w5500_rp_dhcp_assigned() {
     dhcp_assigned = true;
 }
 
-bool w5500_rp_dhcp() {
+void w5500_rp_dhcp() {
     DHCP_init(1, &dhcp_buffer[0]);
     reg_dhcp_cbfunc(NULL, NULL, NULL);
-
-    uint64_t second_time = time_us_64() + 1E6;
-    uint8_t seconds = 0;
-    while (DHCP_run() != DHCP_IP_LEASED) {
-        if (second_time > time_us_64()) {
-            second_time += 1E6;
-            DHCP_time_handler();
-            seconds++;
-            if (seconds > 60) {
-                DHCP_stop();
-                return false;
-            }
-        }
-        sleep_ms(100);
-    }
-    DHCP_stop();
-    return true;
-}
\ No newline at end of file
+}
diff --git a/src/w5500_rp.h b/src/w5500_rp.h
index 0c3a542..335504d 100644
--- a/src/w5500_rp.h
+++ b/src/w5500_rp.h
@@ -5,6 +5,6 @@
 
 void w5500_rp_init();
 void w5500_rp_print_netinfo(wiz_NetInfo netinfo);
-bool w5500_rp_dhcp();
+void w5500_rp_dhcp();
 
 #endif