merge with upstream master

helix/Services/dxf_service.py

@@ -2,9 +2,6 @@ import io
 
 import dxfgrabber
 
-from helix.constants.file_validation_error import FileValidationMessage
-from helix.models.dxf.dxf_error import OldDxfFormatException
-
 
 class DXFService(object):
     """
@@ -51,6 +48,7 @@ class DXFService(object):
 
 
         panels = dxf_helper.generate_panels(modules, translated_modules)
+        # FIXME: Building a graph with many entities is very slow
         node_graph = dxf_helper.build_node_graph(panels, module_constants.panel_spacing)
         subarrays = dxf_helper.detect_subarrays(node_graph, panels)
         for subarray in subarrays: