Test suites usually grow over time as more and more development time is spent on a projects. Overall run-time and performance of Cucumber suites in turn increases, too.

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You can use the very same way Henning suggested for speeding up RSpec some time ago.

Put the following into features/support/deferred_garbage_collection.rb

Before do
  DeferredGarbageCollection.start
end

After do
  DeferredGarbageCollection.reconsider
end

We saw really huge improvement of overall execution time of the suites!