The other day I had to tune a query that has gone awry when it was put on new hardware. The old runtime was around one hour, but on the newer hardware it had dropped to 5 hours and 20 minutes. The main reason i could think of was that the new hardware was placed at our new IAAS solution, and as usual the storage engineers had designed for availability, not performance. The CrystalMark numbers were half of that of our own old hardware.
Join me at this tunings demo (level 300 +) :