Yes, the way the renderer handles the Detail values has changed in some ways. Detail values that were used in 6.2 may not work as well in v7.
Values recommended for v7 would cause very slow rendering in v6, such as a block size of 1 or 2.
However, those are now the best settings to use in 7. Some of the most common and efficient block settings are:
• block size 1, threshold 7 (1x7)
• block size 2, threshold 2 (2x2)