diff --git a/platformio.ini b/platformio.ini
index 56c7f526..3bf62d55 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -190,7 +190,7 @@ build_flags=
     -D PIO_FRAMEWORK_ARDUINO_LWIP2_LOW_MEMORY
 ; -- lvgl build options -----------------------------
     -D LV_MEM_SIZE=12288U              ; 12kB lvgl memory
-    -D LV_ATTRIBUTE_FAST_MEM=
+    -D LV_ATTRIBUTE_FAST_MEM=IRAM_ATTR
 ; -- ArduinoJson build options ----------------------------
     -D ARDUINOJSON_ENABLE_PROGMEM=1    ; for PROGMEM arguments
     -D ARDUINOJSON_ENABLE_STD_STRING=1 ; for std::string
diff --git a/src/main_arduino.cpp b/src/main_arduino.cpp
index b990b941..94c8d440 100644
--- a/src/main_arduino.cpp
+++ b/src/main_arduino.cpp
@@ -169,9 +169,9 @@ IRAM_ATTR void loop()
     }
 
 #ifdef ARDUINO_ARCH_ESP8266
-    delay(2);
+    delay((lv_task_get_idle() >> 6) + 1); // 1..2 ms
 #else
-    delay(6);
+    delay((lv_task_get_idle() >> 4) + 1); // 1..7 ms
 #endif
 }