diff --git a/pybtc/connector/block_loader.py b/pybtc/connector/block_loader.py
index 3b2561f..e42cfa1 100644
--- a/pybtc/connector/block_loader.py
+++ b/pybtc/connector/block_loader.py
@@ -177,7 +177,7 @@ class BlockLoader:
                     self.last_batch_size = len(msg)
                 for i in blocks:
                     self.parent.block_preload.set(i, blocks[i])
-                if blocks:
+                if blocks and index == len(self.worker_busy) - 1:
                     self.parent.utxo.checkpoints.append(i)
 
 
diff --git a/pybtc/connector/utxo.py b/pybtc/connector/utxo.py
index 5dfcf3b..f58ebff 100644
--- a/pybtc/connector/utxo.py
+++ b/pybtc/connector/utxo.py
@@ -49,7 +49,7 @@ class UTXO():
         self.save_process = True
         try:
             # self.log.critical("cached " + str(len(self.cached)) )
-            self.checkpoints = sorted(self.checkpoints)
+            # self.checkpoints = sorted(self.checkpoints)
             checkpoint = self.checkpoints.pop(0)
             lb = 0
             block_changed = False