diff --git a/core/src/core.cpp b/core/src/core.cpp
index ca66da92..7199bee4 100644
--- a/core/src/core.cpp
+++ b/core/src/core.cpp
@@ -106,10 +106,10 @@ int sdrpp_main(int argc, char *argv[]) {
     defConfig["bandPlanEnabled"] = true;
     defConfig["centerTuning"] = false;
     defConfig["colorMap"] = "Classic";
-    defConfig["fastFFT"] = true;
+    defConfig["fastFFT"] = false;
     defConfig["fftHeight"] = 300;
     defConfig["frequency"] = 100000000.0;
-    defConfig["fullWaterfallUpdate"] = true;
+    defConfig["fullWaterfallUpdate"] = false;
     defConfig["max"] = 0.0;
     defConfig["maximized"] = false;
     defConfig["menuOrder"] = {