I'm not sure we want to make this a first class feature in the UI. Would you be able to use the dremel/bigquery table?

I think this is a LUCI builder and the bigquery table isn't ready yet but will be soon.

BQ steps for LUCI were just announced g/luci-announce/IVdte3E-FRw/56A9NhHzAwAJ

i think this use case is a bit different. Here a user is interested in one build, at hand. FWIW the Poluci hack has it
https://luci-ui.appspot.com/p/chromium/buckets/try/builders/linux_chromium_rel_ng/42527
see gray area inside step bars

forgot to mention: I am not sure reordering is a good idea, though. I think "see most time consuming step easily" can be achieved in a different way.

A timeline view has been a fairly popular solution in alternate views (eg ChromeOS's dashboards)

BQ is possibly still good for this, e.g. someone can use:

bq --project_id=cr-buildbucket-dev query --use_legacy_sql=false "SELECT s.name, TIMESTAMP_DIFF(s.end_time, s.start_time, MINUTE) mins
FROM \`cr-buildbucket.builds.completed_BETA\`, UNNEST(steps) s
WHERE builder.project='chromium' AND builder.bucket='try'
AND builder.builder='linux_chromium_rel_ng' AND number=41441
ORDER BY mins DESC LIMIT 10"

A wrapper script to parameterize builder and number would also be practical.

#4 
luci-ui is nice! The ui let me know which steps are dominant part in the build easily.
Is it possible to have such feature in luci-milo also?

#7
Yes, we can get steps ordered by duration by BQ.
But if I could get the result by few clicks instead of copying builder and build number to BQ query, I will be happy.

Hmm, if we just need the feature that's in luci-ui that might not be too bad since it doesn't require client-side logic. I think we can look at adding this later.