Idle dupes is often stealing jobs from auto sweepers, resulting in a job that could be done in seconds take way longer due to dupes travelling from the other corner of the map. This can be a big problem for large colonies because if a dupes is looking for work right when a work is available for the auto sweeper, it will get stolen even if they are not idle and wasting a lot of time when the dupe can do something else and defeats the purpose of building auto sweepers.
1. Build autosweeper next to something that requires supplying 2. Make sure dupes can access to that are 3. Make sure dupes have no other jobs on their priority list 4. Now the autosweeper goes idle forever because the supply jobs keep getting stolen by idle dupes no matter how far they are, significantly decreasing efficiency.