Screenfill ESP8266 very slow

See test case attached: Using the latest version of this repo (commit 136173b61e20a164aa99be9337d7ab311a14be7b) and hardware SPI, clearing the screen with a certain color takes 319ms on an ESP8266 (WEMOS D1 mini). The Arduino MEGA 2560 does it in 289ms, the ESP32 (DOIT ESP32 DEVKIT V1) does it in 32 ms.

Don't know what's wrong with this. Using a comparable library based on the Adafruit library, the screenfill takes only 33ms on the ESP8266.

Don't know whether this also happens with Adafruit hardware. Just wanted to let you know...

Keep up the brilliant work and all the best! P.

Arduino board: ESP8266 WEMOS D1 Mini, EPS32 DOIT DEVKIT V1, Arduino MEGA 2560
Arduino IDE version: 1.8.5
Test case:

#include "SPI.h"
#include "Adafruit_GFX.h"
#include "Adafruit_ILI9341.h"

// Pin settings EPS8266
//#define TFT_CS   SS
//#define TFT_DC   4
//#define TFT_RST  5

// Pin settings EPS32
//#define TFT_CS   SS
//#define TFT_DC   15
//#define TFT_RST  2

// Pin settings Arduino MEGA 2560
#define TFT_CS   SS
#define TFT_DC   7
#define TFT_RST  6

Adafruit_ILI9341 tft = Adafruit_ILI9341(TFT_CS, TFT_DC, TFT_RST);

void setup() {
  #ifdef ESP8266
    Serial.begin(74880);
  #else
    Serial.begin(115200);
  #endif

  tft.begin();

  unsigned long t = millis();
  tft.fillScreen(ILI9341_BLUE);
  Serial.println(millis()-t);
}

void loop() {
  delay(1000);
}

adafruit / Adafruit_ILI9341

Screenfill ESP8266 very slow #39