Add 1µs delay in other appropriate spots

Marlin/stepper.cpp

     #ifdef DUAL_X_CARRIAGE
       WRITE(X2_STEP_PIN, !INVERT_X_STEP_PIN);
     #endif
-    {
-      _delay_us(1U); // wait 1 microsecond
-    }
+
+    _delay_us(1U); // wait 1 microsecond
+
     WRITE(X_STEP_PIN, INVERT_X_STEP_PIN);
     #ifdef DUAL_X_CARRIAGE
       WRITE(X2_STEP_PIN, INVERT_X_STEP_PIN);
     #ifdef DUAL_Y_CARRIAGE
       WRITE(Y2_STEP_PIN, !INVERT_Y_STEP_PIN);
     #endif
-    {
-    float x=1./float(axis+1)/float(axis+2); //wait a tiny bit
-    }
+
+    _delay_us(1U); // wait 1 microsecond
+
     WRITE(Y_STEP_PIN, INVERT_Y_STEP_PIN);
     #ifdef DUAL_Y_CARRIAGE
       WRITE(Y2_STEP_PIN, INVERT_Y_STEP_PIN);
     #ifdef Z_DUAL_STEPPER_DRIVERS
       WRITE(Z2_STEP_PIN, !INVERT_Z_STEP_PIN);
     #endif
-    //wait a tiny bit
-    {
-    float x=1./float(axis+1); //absolutely useless
-    }
+
+    _delay_us(1U); // wait 1 microsecond
+
     WRITE(Z_STEP_PIN, INVERT_Z_STEP_PIN);
     #ifdef Z_DUAL_STEPPER_DRIVERS
       WRITE(Z2_STEP_PIN, INVERT_Z_STEP_PIN);
     WRITE(Y_STEP_PIN, !INVERT_Y_STEP_PIN); 
     WRITE(Z_STEP_PIN, !INVERT_Z_STEP_PIN); 
     
-    //wait a tiny bit
-    {
-    float x=1./float(axis+1); //absolutely useless
-    }
+    _delay_us(1U); // wait 1 microsecond
+
     WRITE(X_STEP_PIN, INVERT_X_STEP_PIN); 
     WRITE(Y_STEP_PIN, INVERT_Y_STEP_PIN); 
     WRITE(Z_STEP_PIN, INVERT_Z_STEP_PIN);