diff --git a/examples/dataflow/structuring.py b/examples/dataflow/structuring.py
index 591d7fc6f..0525e2337 100644
--- a/examples/dataflow/structuring.py
+++ b/examples/dataflow/structuring.py
@@ -1,13 +1,17 @@
+import networkx as nx
+import matplotlib.pyplot as plt
+
 from migen.flow.network import *
 from migen.actorlib import structuring
 from migen.actorlib.sim import *
 from migen.sim.generic import Simulator
 from migen.sim.icarus import Runner
+from migen.flow import perftools
 
 pack_factor = 5
 
 def source_gen():
-	for i in range(80):
+	for i in range(180):
 		yield Token("source", {"value": i})
 
 def sink_gen():
@@ -37,9 +41,16 @@ def main():
 	g.add_connection(from_raw, unpacker)
 	g.add_connection(unpacker, sink)
 	comp = CompositeActor(g)
+	reporter = perftools.DFGReporter(g)
 	
-	fragment = comp.get_fragment()
+	fragment = comp.get_fragment() + reporter.get_fragment()
 	sim = Simulator(fragment, Runner())
-	sim.run(100)
+	sim.run(1000)
+	
+	g_layout = nx.spectral_layout(g)
+	nx.draw(g, g_layout)
+	nx.draw_networkx_edge_labels(g, g_layout, reporter.get_edge_labels())
+	plt.show()
+
 
 main()
diff --git a/migen/flow/perftools.py b/migen/flow/perftools.py
new file mode 100644
index 000000000..0ead73d16
--- /dev/null
+++ b/migen/flow/perftools.py
@@ -0,0 +1,70 @@
+from migen.fhdl.structure import *
+from migen.flow.actor import *
+from migen.sim.generic import PureSimulable
+
+class EndpointReporter(PureSimulable):
+	def __init__(self, endpoint):
+		self.endpoint = endpoint
+		self.reset()
+	
+	def reset(self):
+		self.inactive = 0
+		self.ack = 0
+		self.nack = 0
+	
+	# Total number of cycles per token (inverse token rate)
+	def cpt(self):
+		return (self.inactive + self.nack + 1)/self.ack
+	
+	# Inactivity cycles per token (slack)
+	def ipt(self):
+		return self.inactive/self.ack
+	
+	# NAK cycles per token (backpressure)
+	def npt(self):
+		return self.nack/self.ack
+	
+	def report_str(self):
+		if self.ack:
+			return "C/T={:.2f}\nI/T={:.2f}\nN/T={:.2f}".format(self.cpt(), self.ipt(), self.npt())
+		else:
+			return "N/A"
+	
+	def do_simulation(self, s):
+		if s.rd(self.endpoint.stb):
+			if s.rd(self.endpoint.ack):
+				self.ack += 1
+			else:
+				self.nack += 1
+		else:
+			self.inactive += 1
+
+class DFGReporter:
+	def __init__(self, dfg):
+		assert(not dfg.is_abstract())
+		self.nodepair_to_ep = dict()
+		for u, v, data in dfg.edges_iter(data=True):
+			if (u, v) in self.nodepair_to_ep:
+				ep_to_reporter = self.nodepair_to_ep[(u, v)]
+			else:
+				ep_to_reporter = dict()
+				self.nodepair_to_ep[(u, v)] = ep_to_reporter
+			ep = data["source"]
+			ep_to_reporter[ep] = EndpointReporter(u.actor.endpoints[ep])
+	
+	def get_fragment(self):
+		frag = Fragment()
+		for v1 in self.nodepair_to_ep.values():
+			for v2 in v1.values():
+				frag += v2.get_fragment()
+		return frag
+	
+	def get_edge_labels(self):
+		d = dict()
+		for (u, v), eps in self.nodepair_to_ep.items():
+			if len(eps) == 1:
+				d[(u, v)] = list(eps.values())[0].report_str()
+			else:
+				d[(u, v)] = "\n".join(ep + ":\n" + reporter.report_str()
+					for ep, reporter in eps)
+		return d