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# System prepended metadata

title: 'proposal: use bors to speed up builds'

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# proposal: use bors to speed up builds

## Motivation

Currently, the default is doing a full build over all >110k configurations, for each PR change. That takes 2-3 hrs, which is bad for productivity(tm).

We need a solution that speeds up builds.
Getting more hardware is difficult, we'd need to get *128-256 fast cores* to just cut those times in half.


## Proposal

## definitions

`tPR` = time to get PR feedback
`tMERGE` = time to get to master after merge intent