increase recent blocks estimated fee rate update frequency

src/main/java/com/sparrowwallet/sparrow/control/RecentBlocksView.java

@@ -17,8 +17,10 @@ import javafx.util.Duration;
 
 import java.util.ArrayList;
 import java.util.List;
+import java.util.Map;
 import java.util.concurrent.TimeUnit;
 
+import static com.sparrowwallet.sparrow.AppServices.TARGET_BLOCKS_RANGE;
 import static com.sparrowwallet.sparrow.control.BlockCube.CUBE_SIZE;
 
 public class RecentBlocksView extends Pane {
@@ -136,6 +138,12 @@ public class RecentBlocksView extends Pane {
         }
     }
 
+    public void updateFeeRate(Map<Integer, Double> targetBlockFeeRates) {
+        int defaultTarget = TARGET_BLOCKS_RANGE.get((TARGET_BLOCKS_RANGE.size() / 2) - 1);
+        Double defaultRate = targetBlockFeeRates.get(defaultTarget);
+        updateFeeRate(defaultRate);
+    }
+
     public void updateFeeRate(Double currentFeeRate) {
         if(!getCubes().isEmpty()) {
             BlockCube firstCube = getCubes().getFirst();

src/main/java/com/sparrowwallet/sparrow/wallet/SendController.java

@@ -1411,6 +1411,7 @@ public class SendController extends WalletFormController implements Initializabl
             setFeeRatePriority(getFeeRangeRate());
         }
         feeRange.updateTrackHighlight();
+        recentBlocksView.updateFeeRate(event.getTargetBlockFeeRates());
 
         if(updateDefaultFeeRate) {
             if(getFeeRate() != null && Long.valueOf((long)getFallbackFeeRate()).equals(getFeeRate().longValue())) {