Rust compile times 1min to 15 seconds!

Just wanted to share my recent happiness. Build times have been creeping up over the year of our production application. And yesterday I had had enough waiting a minute for a new dev compile. And yes, these were incremental builds. But I finally dug into workspaces, which took a good day for me to figure out what was actually needed to do. Then slowly ripping apart the spaghetti dependencies of code we had put together. But after a day of work, I have a workspace that has a lot of our dependencies that we don't touch much, and the build on change is less than 15 seconds!