Looks like the upcoming meteor update fixes this.
I updated to the recent beta:
meteor update --release 1.7.1-beta.10
restarted meteor with the profiler:
VELOCITY_DEBUG=1 VELOCITY_DEBUG_MIRROR=1 METEOR_PROFILE=1 meteor --inspect | grep 'less|Total'
and now the less plugin is taking way less than 1 second on file save
and total rebuild time is back within reason:
| │ │ ├─ plugin less 45 ms (2)
| (#5) Total: 4,270 ms (Rebuild App)
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