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Just some insight for this issue:
We had profiled jenkins during our slow startup and found that what was really taking a long time was reading all the builds.
To work around the problem, we did an exhaustive cleanup and setup a very aggressive policy to clean up old builds (only a few selected jobs keep a longer history).
We were able to reduce the startup time from 80min to 5 minutes.
Other things that help: because the problem is due to intensive I/O reading every build file, improving the hardware also helps to alleviate the problem.