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I've compressed a disk volume and now I've noticed that disk access (and/or the system as a whole) seems slower
Explanation: Disk compression was installed on the system and a compressed volume created. Using this volume now seems slower than it was before.
Diagnosis: This is a common side effect of using compression and is generally more often the rule than the exception. Compression works by adding a software interpretation layer and this takes processing time compared to just writing the data directly. The slowdown is especially noticeable on PCs with slower processors. On faster processors, compression can in theory improve overall performance by reducing the number of accesses to the (slow) hard disk. Compression performance is discussed in detail in this section of the Reference Guide.