diff --git a/src/protocol/prf_sharding/feature_label_dot_product.rs b/src/protocol/prf_sharding/feature_label_dot_product.rs
index 3fb35835d..32615d1cc 100644
--- a/src/protocol/prf_sharding/feature_label_dot_product.rs
+++ b/src/protocol/prf_sharding/feature_label_dot_product.rs
@@ -1,5 +1,5 @@
 use futures::{stream::iter as stream_iter, TryStreamExt};
-use futures_util::{future::try_join, StreamExt};
+use futures_util::{future::try_join, stream, StreamExt};
 use ipa_macros::Step;
 
 use std::iter::zip;
@@ -235,24 +235,36 @@ where
     let binary_m_ctx = binary_validator.context();
     let mut num_users_who_encountered_row_depth = vec![0_u32; histogram.len()];
     let ctx_for_row_number = set_up_contexts(&binary_m_ctx, &histogram);
-    let mut futures = Vec::with_capacity(rows_chunked_by_user.len());
-    for rows_for_user in rows_chunked_by_user {
-        let num_user_rows = rows_for_user.len();
-        futures.push(evaluate_per_user_attribution_circuit(
-            ctx_for_row_number[..rows_for_user.len() - 1].to_owned(),
-            num_users_who_encountered_row_depth
-                .iter()
-                .take(num_user_rows)
-                .map(|x| RecordId(*x))
-                .collect(),
-            rows_for_user,
-        ));
-        for i in 0..num_user_rows {
-            num_users_who_encountered_row_depth[i] += 1;
-        }
-    }
+    let stream_of_per_user_circuits = stream::unfold(
+        (
+            num_users_who_encountered_row_depth,
+            ctx_for_row_number,
+            stream_iter(rows_chunked_by_user),
+        ),
+        |state| async move {
+            let (mut count_by_row_depth, contexts, s) = state;
+            if let Some(rows_for_user) = s.next().await {
+                let num_user_rows = rows_for_user.len();
+                let yielded = evaluate_per_user_attribution_circuit(
+                    contexts[..num_user_rows - 1].to_owned(),
+                    num_users_who_encountered_row_depth
+                        .iter()
+                        .take(num_user_rows)
+                        .map(|x| RecordId(*x))
+                        .collect(),
+                    rows_for_user,
+                );
+                for i in 0..num_user_rows {
+                    count_by_row_depth[i] += 1;
+                }
+                Some((yielded, (count_by_row_depth, contexts, s)))
+            } else {
+                None
+            }
+        },
+    );
 
-    let flattenned_stream = seq_join(sh_ctx.active_work(), stream_iter(futures))
+    let flattenned_stream = seq_join(sh_ctx.active_work(), stream_of_per_user_circuits)
         .map(|x| x.unwrap().into_iter())
         .flatten_iters();