Get a fresh set of relay/exit profiles on 0.2.5.5-alpha or later; optimize bottlenecks if found
On #7727 (moved) we had some profile results that we used to identify bottleneck functions in Tor to optimize. We should get some fresh profiles on 0.2.5.4-alpha once it's out (assuming we merge #9841 (moved)), and then see which of those bottlenecks need the most attention.
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