Use file.chunks() on large cached files

src/pretix/helpers/http.py

@@ -0,0 +1,9 @@
+from django.http import StreamingHttpResponse
+
+
+class ChunkBasedFileResponse(StreamingHttpResponse):
+    block_size = 4096
+
+    def __init__(self, streaming_content=(), *args, **kwargs):
+        streaming_content = streaming_content.chunks(self.block_size)
+        super().__init__(streaming_content, *args, **kwargs)