It is amazing that the LCII is about as fast as an LC, according to most benchmarks, despite the LCII's '030 under the hood (bonnet). It takes a special engineering effort to pull off that trick.

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That's what happens when the bus bottlenecks the processor. The 030 in the LCII runs faster than the 020 in the LC, but only internally. Once it has to access something on the bus it runs at either the same speed, or slower if the bus becomes saturated.