Postmortems
Decisions that cost something (time, a team's patience, a project) and what changed because of them. Each one is written on the work it came out of; this is all of them in one place.
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Slow builds were slowing everyone down
Every change had to go through a build before the team could test it, and builds were getting slow. I spent time cleaning up the project and its settings to bring build times down, so we could test changes more often.