cog

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@agis reported that generating a table with 40 rows takes 20 seconds. Let's improve the speed here by looking at how quickly we can make each invocation respond. I think the best we can do without changing how containers are created would be about 8 seconds due to the cost of starting a container for each invocation; still a decent improvement.

Note that we were using an in-house, native version of the "format" bundle - no containers involved. Most of the time was spent in gems being loaded by bundler (ie. Bundler.setup in the 'cog-rb' gem).