Github user BrynCooke commented on the issue:
https://github.com/apache/tinkerpop/pull/470
Exactly. It's currently a huge pain to figure out where things have gone
wrong. Without this patch I have to divide and conquer my code every time I hit
a FastNoSuchElementException.
There is no cost to a try/catch block. The construction of the regular
NoSuchElementException is expensive, but should only be thrown on the top level
traversal.
I actually found no significant difference between branches in terms of
performance.
Mine
```
gremlin> graph = TinkerGraph.open()
==>tinkergraph[vertices:0 edges:0]
gremlin> graph.io(gryo()).readGraph('data/grateful-dead.kryo')
==>null
gremlin> h = graph.traversal()
==>graphtraversalsource[tinkergraph[vertices:808 edges:8049], standard]
gremlin> g = graph.traversal().withoutStrategies(LazyBarrierStrategy.class)
==>graphtraversalsource[tinkergraph[vertices:808 edges:8049], standard]
gremlin> clock(100){ h.V().out().out().out().toSet() }
==>3.33155785
gremlin> clock(20){ g.V().out().out().out().toSet() }
==>520.2727724499999
gremlin> clock(20){ g.V().out().flatMap(out()).flatMap(out()).toSet() }
==>903.5254189999999
gremlin> clock(100){ g.V().repeat(out()).times(3).toSet() }
==>1.8392006699999999
gremlin> clock(100){ h.V().count() }
==>0.0069826
gremlin>
```
Master
```
gremlin> graph = TinkerGraph.open()
==>tinkergraph[vertices:0 edges:0]
gremlin> graph.io(gryo()).readGraph('data/grateful-dead.kryo')
==>null
gremlin> h = graph.traversal()
==>graphtraversalsource[tinkergraph[vertices:808 edges:8049], standard]
gremlin> g = graph.traversal().withoutStrategies(LazyBarrierStrategy.class)
==>graphtraversalsource[tinkergraph[vertices:808 edges:8049], standard]
gremlin> clock(100){ h.V().out().out().out().toSet() }
==>3.59260972
gremlin> clock(20){ g.V().out().out().out().toSet() }
==>519.7500263
gremlin> clock(20){ g.V().out().flatMap(out()).flatMap(out()).toSet() }
==>907.32923195
gremlin> clock(100){ g.V().repeat(out()).times(3).toSet() }
==>1.76869779
gremlin> clock(100){ h.V().count() }
==>0.006985369999999999
gremlin>
```
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