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The 3.5 MHz z80 in the Spectrum is roughly equivalent to a 1Mhz 6502 - barring certain operations that the z80 performs slightly better at; the Speccy did 3D a lot faster than the C64 for that reason. (The reverse is also true, before anyone gets upset - the C64 was far better at 2D than the Speccy).
That this is an accelerated 65 series CPU means that it's going to outperform anything of that era quite handily - the BBC machines were always a lot faster at pretty much everything to start with.
If someone could record the Spectrum Next at 7MHz playing SC then you'd likely see a similar framerate.
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