Slow Hard Drive (5 times) ...
... measured by iQuickMark (Benchmark). ONYX tool could not improve. Overall late MacMini (512 MB HDD, OS X 10.10) is slow, when boot or load programs.
Which tool would you recommend to find reason for that. Did run HDD check by OS X before, without any error messages.
Mac mini, OS X Yosemite (10.10.5)