diff --git a/altimeter/core/artifact_io/writer.py b/altimeter/core/artifact_io/writer.py
index 8604d6c6..2292bfb4 100644
--- a/altimeter/core/artifact_io/writer.py
+++ b/altimeter/core/artifact_io/writer.py
@@ -5,6 +5,7 @@
 import gzip
 import os
 from pathlib import Path
+import tempfile
 from typing import Optional, Type
 
 import boto3
@@ -35,7 +36,11 @@ def write_json(self, name: str, data: BaseModel) -> str:
 
     @abc.abstractmethod
     def write_graph_set(
-        self, name: str, graph_set: ValidatedGraphSet, compression: Optional[str] = None
+        self,
+        name: str,
+        graph_set: ValidatedGraphSet,
+        compression: Optional[str] = None,
+        high_mem: bool = True,
     ) -> str:
         """Write a graph artifact
 
@@ -94,7 +99,11 @@ def write_json(self, name: str, data: BaseModel) -> str:
         return artifact_path
 
     def write_graph_set(
-        self, name: str, graph_set: ValidatedGraphSet, compression: Optional[str] = None
+        self,
+        name: str,
+        graph_set: ValidatedGraphSet,
+        compression: Optional[str] = None,
+        high_mem: bool = True,
     ) -> str:
         """Write a graph artifact
 
@@ -165,7 +174,11 @@ def write_json(self, name: str, data: BaseModel) -> str:
         return f"s3://{self.bucket}/{output_key}"
 
     def write_graph_set(
-        self, name: str, graph_set: ValidatedGraphSet, compression: Optional[str] = None
+        self,
+        name: str,
+        graph_set: ValidatedGraphSet,
+        compression: Optional[str] = None,
+        high_mem: bool = True,
     ) -> str:
         """Write a graph artifact
 
@@ -187,19 +200,34 @@ def write_graph_set(
         graph = graph_set.to_rdf()
         with logger.bind(bucket=self.bucket, key_prefix=self.key_prefix, key=key):
             logger.info(event=LogEvent.WriteToS3Start)
-            with io.BytesIO() as rdf_bytes_buf:
-                if compression is None:
-                    graph.serialize(rdf_bytes_buf, format="xml")
-                elif compression == GZIP:
-                    with gzip.GzipFile(fileobj=rdf_bytes_buf, mode="wb") as gz:
-                        graph.serialize(gz, format="xml")
-                else:
-                    raise ValueError(f"Unknown compression arg {compression}")
-                rdf_bytes_buf.flush()
-                rdf_bytes_buf.seek(0)
-                session = boto3.Session()
-                s3_client = session.client("s3")
-                s3_client.upload_fileobj(rdf_bytes_buf, self.bucket, output_key)
+            if high_mem:
+                with io.BytesIO() as rdf_bytes_buf:
+                    if compression is None:
+                        graph.serialize(rdf_bytes_buf, format="xml")
+                    elif compression == GZIP:
+                        with gzip.GzipFile(fileobj=rdf_bytes_buf, mode="wb") as gz:
+                            graph.serialize(gz, format="xml")
+                    else:
+                        raise ValueError(f"Unknown compression arg {compression}")
+                    rdf_bytes_buf.flush()
+                    rdf_bytes_buf.seek(0)
+                    session = boto3.Session()
+                    s3_client = session.client("s3")
+                    s3_client.upload_fileobj(rdf_bytes_buf, self.bucket, output_key)
+            else:
+                with tempfile.TemporaryDirectory() as graph_dir:
+                    graph_path = Path(graph_dir, "graph.rdf")
+                    with graph_path.open("wb") as graph_fp:
+                        if compression is None:
+                            graph.serialize(graph_fp, format="xml")
+                        elif compression == GZIP:
+                            with gzip.GzipFile(fileobj=graph_fp, mode="wb") as gz:
+                                graph.serialize(gz, format="xml")
+                        else:
+                            raise ValueError(f"Unknown compression arg {compression}")
+                    session = boto3.Session()
+                    s3_client = session.client("s3")
+                    s3_client.upload_file(str(graph_path), self.bucket, output_key)
             s3_client.put_object_tagging(
                 Bucket=self.bucket,
                 Key=output_key,
diff --git a/bin/sfn_compile_graphs.py b/bin/sfn_compile_graphs.py
index b12018fa..5fce55e1 100755
--- a/bin/sfn_compile_graphs.py
+++ b/bin/sfn_compile_graphs.py
@@ -18,6 +18,7 @@ class CompileGraphsInput(BaseImmutableModel):
     config: AWSConfig
     scan_id: str
     account_scan_manifests: Tuple[AccountScanManifest, ...]
+    high_mem: bool = True
 
 
 class CompileGraphsOutput(BaseImmutableModel):
@@ -60,21 +61,25 @@ def lambda_handler(event: Dict[str, Any], _: Any) -> Dict[str, Any]:
     if not graph_sets:
         raise Exception("BUG: No graph_sets generated.")
     validated_graph_set = ValidatedGraphSet.from_graph_set(GraphSet.from_graph_sets(graph_sets))
-    master_artifact_path = artifact_writer.write_json(name="master", data=validated_graph_set)
-    start_time = validated_graph_set.start_time
-    end_time = validated_graph_set.end_time
-    scan_manifest = ScanManifest(
-        scanned_accounts=scanned_accounts,
-        master_artifact=master_artifact_path,
-        artifacts=artifacts,
-        errors=errors,
-        unscanned_accounts=list(unscanned_accounts),
-        start_time=start_time,
-        end_time=end_time,
-    )
-    artifact_writer.write_json("manifest", data=scan_manifest)
+    if compile_graphs_input.high_mem:
+        master_artifact_path = artifact_writer.write_json(name="master", data=validated_graph_set)
+        start_time = validated_graph_set.start_time
+        end_time = validated_graph_set.end_time
+        scan_manifest = ScanManifest(
+            scanned_accounts=scanned_accounts,
+            master_artifact=master_artifact_path,
+            artifacts=artifacts,
+            errors=errors,
+            unscanned_accounts=list(unscanned_accounts),
+            start_time=start_time,
+            end_time=end_time,
+        )
+        artifact_writer.write_json("manifest", data=scan_manifest)
     rdf_path = artifact_writer.write_graph_set(
-        name="master", graph_set=validated_graph_set, compression=GZIP
+        name="master",
+        graph_set=validated_graph_set,
+        compression=GZIP,
+        high_mem=compile_graphs_input.high_mem,
     )
 
     return CompileGraphsOutput(