Performance
TrueCrypt supports parallelized encryption for multi-core systems and, under Microsoft Windows, pipelined read/write operations (a form of asynchronous processing) to reduce the performance hit of encryption and decryption. On some Intel processors, TrueCrypt supports hardware-accelerated AES to further improve performance. The performance impact of disk encryption is especially noticeable on operations which would normally use Direct Memory Access (DMA), as all data must pass through the CPU for decryption, rather than being copied directly from disk to RAM.
In a test carried out by Tom's Hardware, although TrueCrypt is slower compared to an unencrypted disk, the overhead of real-time encryption was found to be similar regardless of whether mid-range or state-of-the-art hardware is in use, and this impact was "quite acceptable". In another article the performance cost was found to be unnoticeable when working with "popular desktop applications in a reasonable manner", but it was noted that "power users will complain".
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