Only refresh abilities if needed

paper-server/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java

@@ -2120,12 +2120,13 @@ public class CraftPlayer extends CraftHumanEntity implements Player {
 
     @Override
     public void setFlying(boolean value) {
+        boolean needsUpdate = getHandle().getAbilities().flying != value; // Paper - Only refresh abilities if needed
         if (!this.getAllowFlight()) {
             Preconditions.checkArgument(!value, "Player is not allowed to fly (check #getAllowFlight())");
         }
 
         this.getHandle().getAbilities().flying = value;
-        this.getHandle().onUpdateAbilities();
+        if (needsUpdate) this.getHandle().onUpdateAbilities(); // Paper - Only refresh abilities if needed
     }
 
     @Override