During normal use, the performance degradation is barely noticeable, it _feels_ like 10%–15%. Things become a bit more critical when working with larger files o

During normal use, the performance degradation is barely noticeable, it _feels_ like 10%–15%. Things become a bit more critical when working with larger files or during heavy I/O. One thing to consider, however, are SSDs. To my knowledge, encrypted data is only written to blocks that already contain random data. You therefore might want to look for disks whose performance does not degrade that much when free blocks are no longer available.