According to the Globe, there has been a dramatic improvement in immigration/customs wait times at Logan after Sen. Markey and others complained to the DHS a few months ago.
https://www.bostonglobe.com/business/2015/08/06/customs-delays-logan-airport-ease-after-congressional-scolding/RDzWToiXuAnuUWqTWw0aFI/story.html
https://www.bostonglobe.com/business/2015/08/06/customs-delays-logan-airport-ease-after-congressional-scolding/RDzWToiXuAnuUWqTWw0aFI/story.html