SysInfo isn’t a good benchmarking tool, the calculations it does are not very representative of real world app performance (hence why it is named “SysInfo”) — it’s a tool to get a quick overview of what system you are dealing with and maybe get a ballpark performance number.
If you use a recognized “proper” benchmarking tool with a suite of tests like AIBB (Amiga Intuition-Based Benchmarks), it comes out roughly like this when you ask it for a summary:
MiSTer Minimig core is:
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~5× the speed of an Amiga 1200
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~2× the speed of an Amiga 3000/25
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~1.5× the speed of an Amiga 4000/040 — but is slower than the A4000 on gfx and floating point
As stated in that thread, it’s not too far off the experience of using an A4000 or an A1200 with a 50MHz ’030 expansion. The disks are a lot faster than your typical setup at the time though, which makes it feel a lot snappier in use.
It's not even in the ballpark of a correct CPU speed, never mind cycle accuracy!
To my knowledge, there is no software, games or demos for the Amiga that requires or relies on 68020 cycle accuracy.
For the 68000, the case is of course different. :)