diff --git a/compiler/src/prog8/astvm/AstVm.kt b/compiler/src/prog8/astvm/AstVm.kt
index 0962627b6..a27d75371 100644
--- a/compiler/src/prog8/astvm/AstVm.kt
+++ b/compiler/src/prog8/astvm/AstVm.kt
@@ -286,7 +286,7 @@ class AstVm(val program: Program) {
 
     private fun executeStatement(sub: INameScope, stmt: IStatement) {
         instructionCounter++
-        if (instructionCounter % 100 == 0)
+        if (instructionCounter % 200 == 0)
             Thread.sleep(1)
         when (stmt) {
             is NopStatement, is Label, is Subroutine -> {
diff --git a/examples/mandelbrot.p8 b/examples/mandelbrot.p8
index f32b08784..e2f9e0e31 100644
--- a/examples/mandelbrot.p8
+++ b/examples/mandelbrot.p8
@@ -39,9 +39,9 @@
             }
         }
 
-        float duration = floor(((c64.TIME_LO as float)
+        float duration = ((c64.TIME_LO as float)
                                 + 256.0*(c64.TIME_MID as float)
-                                + 65536.0*(c64.TIME_HI as float))/60.0)
+                                + 65536.0*(c64.TIME_HI as float))/60.0
         c64scr.plot(0, 21)
         c64scr.print("finished in ")
         c64flt.print_f(duration)