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SSD Performance In Crysis 2, World Of Warcraft, And Civilization V

Loading A Realm In World Of Warcraft: Cataclysm

Overall StatisticsWorld of Warcraft: Cataclysm: Realm Loading
Elapsed Time00:18
Read Operations5 727
Write Operations124
Data Read127.58 MB
Data Written1.18 MB
Disk Busy Time0.93 s
Average Data Rate138.15 MB/

Blizzard purposely designed World of Warcraft to have a more modular file system. Updates from Blizzard are distributed as MPQ archives, which are decompressed and extracted to their proper locations. This works well because adding a few files can easily expand the WoW universe.

However, this translates into storing a lot of individual files of varying sizes, which makes for a random I/O workload involving mixed transfer sizes. That’s what we see here when we load to Crushblow.

Random performance on a hard drive is still terrible, which is why WoW gamers are going to experience a bigger speed-up loading a level than Crysis 2 players as they ditch their disks in favor of SSDs.

I/O Trends:

  • 88% of all operations occur at a queue depth of one
  • 62% of all operations are random

Seek Distance


Transfer Size