There are hundreds of senate-confirmed positions that need to be filled, and the Democrats are insisting on using the 30 hours of hearings, that current rules allow them, on each. At this rate, they will never be done.
The Republican Senate needs to "nuke option" that rule, for non-cabinet-level appointees. For low-level appointees, the names should be announced, then two weeks later a vote will be held with no debate.
According to the article posted here, there are actually very few nominees awaiting Senate confirmation. The real problem is that the U.S. Justice Department and other executive branch agencies have been very slow in conducting background checks. This came up because the U.S. does not have an ambassador to Great Britain right now. Robert Wood Johnson IV was named to this post back in March, but he has never been confirmed and technically isn't really a "nominee" yet because he hasn't cleared the background check process yet. A candidate for one of these posts requiring Senate confirmation isn't officially a "nominee" until this process is completed.