Added a config switch to enable temporal dithering. But at least for my setup something is too slow - it's flickering.

include/config.h

@@ -17,6 +17,7 @@
 #define DATA_PIN 14
 #define COLOR_ORDER GRB
 #define BRIGHTNESS 20 // Can be overwritten via MQTT_TOPIC_BRIGHTNESS
+#define TEMPORAL_DITHERING 0
 
 #define NTP_SERVER "pool.ntp.org"
 #define NTP_INTERVAL 300000

src/fastled.cpp

@@ -6,4 +6,5 @@ CRGB leds[LED_COUNT];
 void fastled_setup() {
   FastLED.addLeds<LED_TYPE,DATA_PIN,COLOR_ORDER>(leds, LED_COUNT).setCorrection(TypicalLEDStrip);
   FastLED.setBrightness(BRIGHTNESS);
+  FastLED.setDither(TEMPORAL_DITHERING);
 };

src/pitrix.cpp

@@ -60,9 +60,9 @@ void loop() {
     if (current_effect->can_be_shown_with_clock()) {
       effect_clock.loop(current_effect->clock_as_mask(), CRGB(0xFFFFFF), CRGB(0x000000));
     }
-
-    FastLED.show();
   }
+  
+  FastLED.show();
 
   if (MONITOR_LOOP_TIMES && millis()-loop_started_at>=MONITOR_LOOP_TIME_THRESHOLD) {
     LOG("Core * Loop took "); LOG(millis()-loop_started_at); LOGln("ms.");