MIPS=meaningless indicator of performance.
Other than MIPS what else makes people think the 68060 @50 mhz is only 1.3 times faster than a 68040@40 mhz?
mips is something invented to calculate integer performance
you can use it to get an idea how fast the cpu will complete certain task
however there are buggy programs like sysspeed that report wrong and inaccurate results
but the 060/50mhz will complete a task 1.3x faster than a 040/40mhz and 2x faster than a 040/25
That's because the 040 and the 060 have identical cores....in fact the 040 overclocked to 50mhz performs identical as the 060/50
and for your question ...you can use real life benchmarks to measure cpu performance
something like a picture converter or a sound converter
also someone who had both cpus...the 040/40 and the 060/50 should affirm that the 060 is not much faster...almost impossible to notice a difference on workbench
you note it on benchmarks or playing games like doom or quake where the 060 will work fast