diff --git a/wled00/WS2812FX.cpp b/wled00/WS2812FX.cpp
index 3281f8733..333ad0a94 100644
--- a/wled00/WS2812FX.cpp
+++ b/wled00/WS2812FX.cpp
@@ -1634,7 +1634,7 @@ uint16_t WS2812FX::mode_fire_2012(void)
 {
   // Step 1.  Cool down every cell a little
   for( int i = SEGMENT.start; i < SEGMENT.stop; i++) {
-    _locked[i] = qsub8(_locked[i],  random8(0, ((COOLING * 10) / SEGLEN) + 2));
+    _locked[i] = qsub8(_locked[i],  random8(0, (((20 + SEGMENT.speed /3) * 10) / SEGLEN) + 2));
   }
 
   // Step 2.  Heat from each cell drifts 'up' and diffuses a little
@@ -1653,7 +1653,7 @@ uint16_t WS2812FX::mode_fire_2012(void)
     CRGB color = ColorFromPalette( currentPalette, min(_locked[j],240), 255, LINEARBLEND);
     setPixelColor(j, color.red, color.green, color.blue);
   }
-  return 10 + (uint16_t)(255 - SEGMENT.speed)/6;
+  return 20;
 }
 
 
diff --git a/wled00/src/dependencies/json/AsyncJson-v6.h b/wled00/src/dependencies/json/AsyncJson-v6.h
index 72af53c09..c6ceeaf53 100644
--- a/wled00/src/dependencies/json/AsyncJson-v6.h
+++ b/wled00/src/dependencies/json/AsyncJson-v6.h
@@ -15,11 +15,7 @@
 #include "ArduinoJson-v6.h"
 #include <Print.h>
 
-#if ARDUINOJSON_VERSION_MAJOR == 5
-  #define ARDUINOJSON_5_COMPATIBILITY
-#else
-  #define DYNAMYC_JSON_DOCUMENT_SIZE  4096
-#endif
+#define DYNAMYC_JSON_DOCUMENT_SIZE  4096
 
 constexpr const char* JSON_MIMETYPE = "application/json";
 
@@ -57,27 +53,13 @@ class ChunkPrint : public Print {
 class AsyncJsonResponse: public AsyncAbstractResponse {
   private:
 
-#ifdef ARDUINOJSON_5_COMPATIBILITY
-    DynamicJsonBuffer _jsonBuffer;
-#else
     DynamicJsonDocument _jsonBuffer;
-#endif
 
     JsonVariant _root;
     bool _isValid;
 
   public:    
 
-#ifdef ARDUINOJSON_5_COMPATIBILITY
-    AsyncJsonResponse(bool isArray=false): _isValid{false} {
-      _code = 200;
-      _contentType = JSON_MIMETYPE;
-      if(isArray)
-        _root = _jsonBuffer.createArray();
-      else
-        _root = _jsonBuffer.createObject();
-    }
-#else
     AsyncJsonResponse(size_t maxJsonBufferSize = DYNAMYC_JSON_DOCUMENT_SIZE, bool isArray=false) : _jsonBuffer(maxJsonBufferSize), _isValid{false} {
       _code = 200;
       _contentType = JSON_MIMETYPE;
@@ -86,18 +68,13 @@ class AsyncJsonResponse: public AsyncAbstractResponse {
       else
         _root = _jsonBuffer.createNestedObject();
     }
-#endif
 
     ~AsyncJsonResponse() {}
     JsonVariant & getRoot() { return _root; }
     bool _sourceValid() const { return _isValid; }
     size_t setLength() {
 
-#ifdef ARDUINOJSON_5_COMPATIBILITY      
-      _contentLength = _root.measureLength();
-#else
       _contentLength = measureJson(_root);
-#endif
 
       if (_contentLength) { _isValid = true; }
       return _contentLength;
@@ -108,16 +85,12 @@ class AsyncJsonResponse: public AsyncAbstractResponse {
     size_t _fillBuffer(uint8_t *data, size_t len){
       ChunkPrint dest(data, _sentLength, len);
 
-#ifdef ARDUINOJSON_5_COMPATIBILITY      
-      _root.printTo( dest ) ;
-#else
       serializeJson(_root, dest);
-#endif
       return len;
     }
 };
 
-typedef std::function<void(AsyncWebServerRequest *request, JsonVariant &json)> ArJsonRequestHandlerFunction;
+typedef std::function<void(AsyncWebServerRequest *request, JsonObject json)> ArJsonRequestHandlerFunction;
 
 class AsyncCallbackJsonWebHandler: public AsyncWebHandler {
 private:
@@ -126,18 +99,12 @@ protected:
   WebRequestMethodComposite _method;
   ArJsonRequestHandlerFunction _onRequest;
   int _contentLength;
-#ifndef ARDUINOJSON_5_COMPATIBILITY   
   const size_t maxJsonBufferSize;
-#endif
   int _maxContentLength;
 public:
-#ifdef ARDUINOJSON_5_COMPATIBILITY      
-  AsyncCallbackJsonWebHandler(const String& uri, ArJsonRequestHandlerFunction onRequest) 
-  : _uri(uri), _method(HTTP_POST|HTTP_PUT|HTTP_PATCH), _onRequest(onRequest), _maxContentLength(16384) {}
-#else
+
   AsyncCallbackJsonWebHandler(const String& uri, ArJsonRequestHandlerFunction onRequest, size_t maxJsonBufferSize=DYNAMYC_JSON_DOCUMENT_SIZE) 
   : _uri(uri), _method(HTTP_POST|HTTP_PUT|HTTP_PATCH), _onRequest(onRequest), maxJsonBufferSize(maxJsonBufferSize), _maxContentLength(16384) {}
-#endif
   
   void setMethod(WebRequestMethodComposite method){ _method = method; }
   void setMaxContentLength(int maxContentLength){ _maxContentLength = maxContentLength; }
@@ -161,16 +128,10 @@ public:
     if(_onRequest) {
       if (request->_tempObject != NULL) {
 
-#ifdef ARDUINOJSON_5_COMPATIBILITY    
-        DynamicJsonBuffer jsonBuffer;
-        JsonVariant json = jsonBuffer.parse((uint8_t*)(request->_tempObject));
-        if (json.success()) {
-#else
         DynamicJsonDocument jsonBuffer(this->maxJsonBufferSize);
         DeserializationError error = deserializeJson(jsonBuffer, (uint8_t*)(request->_tempObject));
         if(!error) {
-          JsonVariant json = jsonBuffer.as<JsonVariant>();
-#endif
+          JsonObject json = jsonBuffer.as<JsonObject>();
 
           _onRequest(request, json);
           return;
diff --git a/wled00/wled00.ino b/wled00/wled00.ino
index 2f7e4c27c..6aa5092fd 100644
--- a/wled00/wled00.ino
+++ b/wled00/wled00.ino
@@ -98,7 +98,7 @@
 
 
 //version code in format yymmddb (b = daily build)
-#define VERSION 1908211
+#define VERSION 1908251
 char versionString[] = "0.8.5-dev";
 
 
diff --git a/wled00/wled18_server.ino b/wled00/wled18_server.ino
index c0881161a..b9ceb9e8b 100644
--- a/wled00/wled18_server.ino
+++ b/wled00/wled18_server.ino
@@ -70,8 +70,7 @@ void initServer()
     serveJson(request);
   });
 
-  AsyncCallbackJsonWebHandler* handler = new AsyncCallbackJsonWebHandler("/json", [](AsyncWebServerRequest *request, JsonVariant &json) {
-    JsonObject root = json.to<JsonObject>();
+  AsyncCallbackJsonWebHandler* handler = new AsyncCallbackJsonWebHandler("/json", [](AsyncWebServerRequest *request, JsonObject root) {
     if (root.isNull()){request->send(500, "application/json", "{\"error\":\"Parsing failed\"}"); return;}
     if (deserializeState(root)) { serveJson(request); return; } //if JSON contains "v" (verbose response)
     request->send(200, "application/json", "{\"success\":true}");