I'm not sure I've entirely formed the idea in my head, but I'll ask anyway...
One of the things I learned here in RO is that the BBC gained speed by using faster RAM, thereby avoiding cycle stealing during video refresh. IIRC, this resulted in ~30% better performance.
My question is whether it would be possible to get the same performance boost using solutions that were available earlier and were cost effective at that time, that is, the ~1981 time frame.
I assume dual-ported RAM would allow this, but was this widely available and cost competitive? Could one have a small section of dual-port and then a larger bank of "normal" RAM without issue?
could one mix high- and low-speed parts on a single bus? Do the refresh requirements change as well, and would that preclude such solutions?
something else I haven't thought of?