Rebuild slower in 1.2

From the announce:

We’ve also got a new build pipeline in Meteor 1.2 that rebuilds much faster (especially on large code bases)

I have just updated my project from 1.1 to 1.2 and rebuild time has increased from 5s to 7s (under Windows).
Anyone had the same experience?

I am using Ubuntu and have not seen any improvement in build time since updating to 1.2

for me build time more than doubled…frustrating to wait >15 sec after each change with almost no packages installed…

You might want to provide data here: