It means that, according to the charts above, your machine is being beaten by seven of the iMacs in single core performance bench marks, and nine of them in multicore bench marks.
It's beaten by six of the iMacs in the graphics processor bench marks.
I hope this helps in understanding what the test results mean. ;^)
I paid about $1,000 for the parts for my desktop pc.
It looks to me that the i5 is about the same be it used on a Mac or a Windows pc.