Assume that you enable the Buffer Pool Extension (BPE) feature in Microsoft SQL Server 2014. When you use the log shipping, the log shipping restore job takes a long time on the secondary server.
Cumulative Update information
The issue was first fixed in the following cumulative update for SQL Server 2014:
Each new cumulative update for SQL Server contains all the hotfixes and all the security fixes that were included with the previous cumulative update. We recommend that you download and install the latest cumulative update for SQL Server 2014:
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.