вот
тут написано
...
Enterprise Resource Planning
Microsoft Dynamics AX
Record scale improvement of 70% in throughput, scalability, and response time
Benchmark tests demonstrate record scale showing up to 70 percent improvement in throughput scalability and response time; maximizing performance while minimizing database growth using SQL Server 2008 database compression.
....
но сам я не сравнивал и тесты не гонял
сжатие бекапов облегчает жизнь