The queue block size has been increased allowing you to process more transactions in a single block.
The queue block size is the number of bytes in a contiguous block of memory used by stable queue structures. In earlier versions of Replication Server, the queue block size is fixed at 16KB.
See “Increasing queue block size,” in Chapter 4, “Performance Tuning” in the Replication Server Administration Guide Volume 2 for recommendations, prerequisites, and instructions for configuring the queue block size.