There are a number of specific causes for hang during rendering (though it isn't a memory issue - memory issues generally cause the app to be closed). Looking at this timeline, I am guessing it's the 600% speed increases. First, try turning off 'Maintain Audio Pitch' in the Speed tool (this will affect all clips on the track) and see if that resolves the problem. If not, try adjusting the speed down to 200%. If that solves the problem, then I would recommend first processing the clip separately at 600% in its own project, then bring it into your main project.
If none of those help, please email us again and we'll have you send us the project archive and we'll see if we can determine the cause.
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