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===Performance=== The [[I/O]] performance penalty for using FileVault 2 was found to be in the order of around 3% when using CPUs with the [[AES instruction set]], such as the [[Broadwell (microarchitecture)|Intel Core i]], and [[OS X Yosemite|OS X 10.10.3 Yosemite]].<ref>{{cite web |url=https://archive.techarp.com/showarticle0037.html?artno=877&pgno=1 |website=Tech ARP |title=How Fast is the 512 GB PCIe X4 SSD in the 2015 MacBook Pro?}}</ref> Performance deterioration will be larger for CPUs without this instruction set, such as older [[Intel Core (microarchitecture)|Core]] CPUs.
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