hashcat v4.0.0 slow with itunes backup 14800

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True @ password length, but for this change the reason was fine tuning. In general it's better to have a low number of threads, as long as it doesn't drop the performance. For NV the ideal OpenCL thread number is the warp size (and for AMD the wavefront number). The lower the thread count, the smaller the workload, the faster the restore checkpoint and other things. There's a few GPU which in combination with some particular hash modes do not scale that good on a low thread count and 14800 is one of them.