Github user zsxwing commented on the pull request:
https://github.com/apache/spark/pull/7071#issuecomment-116509232
> And as I mentioned above, I was made to wait to view timeline until
entire page is rendered.
Sorry that it's not clear about the purpose of this PR.
Before this patch, people will see the following incomplete page for
several seconds. The browser won't display the content below the timeline
because `drawTaskAssignmentTimeline` blocks the whole page. People need to wait
until `drawTaskAssignmentTimeline` finishes.
After this patch, people can see the complete page at once except the
timeline. And the timeline is hidden, so it's not a big deal.
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