diff --git a/metricflow/dataflow/optimizer/source_scan/cm_branch_combiner.py b/metricflow/dataflow/optimizer/source_scan/cm_branch_combiner.py
index 233629e7a..3209e34b8 100644
--- a/metricflow/dataflow/optimizer/source_scan/cm_branch_combiner.py
+++ b/metricflow/dataflow/optimizer/source_scan/cm_branch_combiner.py
@@ -133,7 +133,7 @@ def __init__(self, left_branch_node: DataflowPlanNode) -> None:  # noqa: D107
         self._current_left_node: DataflowPlanNode = left_branch_node
 
     def _log_visit_node_type(self, node: DataflowPlanNode) -> None:
-        logger.debug(lambda: f"Visiting {node.node_id}")
+        logger.debug(LazyFormat(lambda: f"Visiting {node.node_id}"))
 
     def _log_combine_failure(
         self,
diff --git a/metricflow/dataflow/optimizer/source_scan/source_scan_optimizer.py b/metricflow/dataflow/optimizer/source_scan/source_scan_optimizer.py
index c84035335..95c0aeec3 100644
--- a/metricflow/dataflow/optimizer/source_scan/source_scan_optimizer.py
+++ b/metricflow/dataflow/optimizer/source_scan/source_scan_optimizer.py
@@ -280,7 +280,14 @@ def visit_combine_aggregated_outputs_node(  # noqa: D102
                     for branch_combination_result in combination_results
                 ]
 
-        logger.debug(lambda: f"Got {len(combined_parent_branches)} branches after combination")
+        logger.debug(
+            LazyFormat(
+                "Possible branches combined.",
+                count_of_branches_before_combination=len(optimized_parent_branches),
+                count_of_branches_after_combination=len(combined_parent_branches),
+            )
+        )
+
         assert len(combined_parent_branches) > 0
 
         # If we were able to reduce the parent branches of the CombineAggregatedOutputsNode into a single one, there's