Hello everybody, first time poster here. Our customer complains about poor database application performance and is right about it. In fact, if we restore the database on our system (or virtually any other system, even an old laptop), we experience about ten times better perfomance as compared to the customer's server, so it is hardly related to the database structure. After some investigation (SQL profiler, performance counters) we narrowed the question to the write operations, which are much slower on the customer's server, but we have no idea why (there is no significant difference for read operations). Customer's hardware: Dell PowerEdge R410, one quadcore Intel Xeon E5506 2.13 GHz, 16 GB RAM (DDR3 800 MHz), 2x 1TB SATA Hard Disk 7.2K (Seagate ST31000524NS) as RAID 1, 64K strip size, SAS 6/iR integrated controller. Customer's OS: Windows Server 2008 R2 Standard Customer's SQL Server: MS SQL 2008 Any clues?