A600 PCMCIA SRAM = faster than chip ram because it is only available to CPU, Agnus DMA accesses won't slow it down. SRAM raw access speed itself may not be any faster than chip RAM but it isn't the important part.
A1200 PCMCIA SRAM = slow because AGA Chip RAM and 68020 CPU has 32-bit data bus but PCMCIA bus is only 16-bit.
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