Per review by @earlephilhower

Author: dok-net

cores/esp8266/core_esp8266_i2s.cpp

@@ -313,7 +313,7 @@ static bool _i2s_write_sample(uint32_t sample, bool nb) {
         if (tx->slc_queue_len > 0) {
           break;
         } else {
-          optimistic_yield(1000);
+          optimistic_yield(10000);
         }
       }
     }
@@ -362,7 +362,7 @@ static uint16_t _i2s_write_buffer(const int16_t *frames, uint16_t frame_count, b
                         if (tx->slc_queue_len > 0) {
                           break;
                         } else {
-                          optimistic_yield(1000);
+                          optimistic_yield(10000);
                         }
                     }
                 }
@@ -422,7 +422,7 @@ bool i2s_read_sample(int16_t *left, int16_t *right, bool blocking) {
         if (rx->slc_queue_len > 0){
           break;
         } else {
-          optimistic_yield(1000);
+          optimistic_yield(10000);
         }
       }
     }

cores/esp8266/flash_hal.cpp

@@ -30,7 +30,7 @@ extern "C" {
 }
 
 int32_t flash_hal_read(uint32_t addr, uint32_t size, uint8_t *dst) {
-    optimistic_yield(1000);
+    optimistic_yield(10000);
 
     // We use flashRead overload that handles proper alignment
     if (ESP.flashRead(addr, dst, size)) {
@@ -41,7 +41,7 @@ int32_t flash_hal_read(uint32_t addr, uint32_t size, uint8_t *dst) {
 }
 
 int32_t flash_hal_write(uint32_t addr, uint32_t size, const uint8_t *src) {
-    optimistic_yield(1000);
+    optimistic_yield(10000);
 
     // We use flashWrite overload that handles proper alignment
     if (ESP.flashWrite(addr, src, size)) {
@@ -60,7 +60,7 @@ int32_t flash_hal_erase(uint32_t addr, uint32_t size) {
     const uint32_t sector = addr / SPI_FLASH_SEC_SIZE;
     const uint32_t sectorCount = size / SPI_FLASH_SEC_SIZE;
     for (uint32_t i = 0; i < sectorCount; ++i) {
-        optimistic_yield(1000);
+        optimistic_yield(10000);
         if (!ESP.flashEraseSector(sector + i)) {
             DEBUGV("_spif_erase addr=%x size=%d i=%d\r\n", addr, size, i);
             return FLASH_HAL_ERASE_ERROR;

cores/esp8266/uart.cpp

@@ -512,7 +512,7 @@ uart_do_write_char(const int uart_nr, char c)
 {
     while(uart_tx_fifo_full(uart_nr))
     {
-        optimistic_yield(1000UL);
+        optimistic_yield(10000UL);
     }
 
     USF(uart_nr) = c;

libraries/ESP8266WiFi/src/WiFiClient.cpp

@@ -253,7 +253,7 @@ int WiFiClient::available()
     int result = _client->getSize();
 
     if (!result) {
-        optimistic_yield(10000);
+        optimistic_yield(100);
     }
     return result;
 }

libraries/ESP8266WiFi/src/WiFiUdp.cpp

@@ -118,7 +118,7 @@ int WiFiUDP::available() {
     if (!result) {
         // yielding here will not make more data "available",
         // but it will prevent the system from going into WDT reset
-        optimistic_yield(10000);
+        optimistic_yield(100UL);
     }
 
     return result;
@@ -195,7 +195,7 @@ int WiFiUDP::parsePacket()
         return 0;
 
     if (!_ctx->next()) {
-        optimistic_yield(1000);
+        optimistic_yield(100UL);
         return 0;
     }
 

libraries/Wire/Wire.cpp

@@ -227,7 +227,7 @@ int TwoWire::available(void)
     {
         // yielding here will not make more data "available",
         // but it will prevent the system from going into WDT reset
-        optimistic_yield(10000UL);
+        optimistic_yield(100UL);
     }
 
     return result;