If this flag is set, QuickBuild will aggregate adjacent builds from the same configuration in this queue when it thinks proper. Considering this case: You set up continuous integration for a project which takes a long time to build. However, developers checkin their code frequently, which cause a lot of build requests sent to QuickBuild. By setting this flag, these build requests will be aggregated to form much fewer requests which will greatly save CPU cycles of your build machine, while still keeps the ability to timely inform developers about whether or not their checkin breaks the code base.