Set to -O2 mode 
idf.py menuconfig -> compiler options

### Opt
CONFIG_BOOTLOADER_COMPILER_OPTIMIZATION_PERF=y
CONFIG_COMPILER_OPTIMIZATION_PERF=y
CONFIG_FREERTOS_HZ=1000

### CACHE
CONFIG_ESP32S3_INSTRUCTION_CACHE_32KB=y
CONFIG_ESP32S3_INSTRUCTION_CACHE_LINE_32B=y
CONFIG_ESP32S3_DATA_CACHE_64KB=y
CONFIG_ESP32S3_DATA_CACHE_LINE_64B=y
CONFIG_ESP32S3_DATA_CACHE_LINE_SIZE=64

=================================
Initialize variables with 0 for -O2

--- TPS546.c.ORIG       2025-05-20 18:47:35.414286863 -0700
+++ TPS546.c    2025-05-20 18:18:55.246900821 -0700
@@ -333,8 +333,8 @@
 esp_err_t TPS546_init(TPS546_CONFIG config)
 {
        uint8_t data[7];
-    uint8_t u8_value;
-    uint16_t u16_value;
+    uint8_t u8_value = 0;
+    uint16_t u16_value = 0;
     uint8_t read_mfr_revision[4];
     int temp;
     uint8_t comp_config[5];
@@ -633,7 +633,7 @@
 
 int TPS546_get_frequency(void)
 {
-    uint16_t value;
+    uint16_t value = 0;
     int freq;
 
     smb_read_word(PMBUS_FREQUENCY_SWITCH, &value);
@@ -644,7 +644,7 @@
 
 void TPS546_set_frequency(int newfreq)
 {
-    uint16_t value;
+    uint16_t value = 0;
     //int freq;
 
     ESP_LOGI(TAG, "Writing new frequency: %d", newfreq);
@@ -659,7 +659,7 @@
 
 int TPS546_get_temperature(void)
 {
-    uint16_t value;
+    uint16_t value = 0;
     int temp;
 
     smb_read_word(PMBUS_READ_TEMPERATURE_1, &value);
@@ -669,7 +669,7 @@
 
 float TPS546_get_vin(void)
 {
-    uint16_t u16_value;
+    uint16_t u16_value = 0;
     float vin
 
     /* Get voltage input (ULINEAR16) */
@@ -687,7 +687,7 @@
 
 float TPS546_get_iout(void)
 {
-    uint16_t u16_value;
+    uint16_t u16_value = 0;
     float iout;
 
     //set the phase register to 0xFF to read all phases
@@ -713,7 +713,7 @@

 float TPS546_get_vout(void)
 {
-    uint16_t u16_value;
+    uint16_t u16_value = 0;
     float vout;
 
     /* Get voltage output (ULINEAR16) */
@@ -1009,7 +1009,7 @@
 
 void TPS546_show_voltage_settings(void)
 {
-    uint16_t u16_value;
+    uint16_t u16_value = 0;
     uint8_t u8_value;
     float f_value;
========================