Consonant and Vowel masks

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This has been answered tons of times here on the forum. hashcat cannot make use of the inner loop acceleration while at the same time has to copy each password candidate (base section) over PCI Express, so PCI becomes the bottleneck. If you want fixed prefixes, be more creative, for example with a rule in combination with a piped maskprocessor output or use the prefix as a fake salt if the hash-mode supports it.