68HC11F1 and external RAM performance

Hi everybody,
I am currently working on a 68H11F1 only using the 1kB internal RAM. A
so small amount of RAM doesn't allow many evolutions of the software.
That's why I am wandering which would be the perfomance drawbacks if I
use 4KB external RAM ?
Could some of you tell me (our spot me a good doc) about the difference
between internal and external RAM access time on a 68HC11F1 ?

Thanks
Wolfgang

.

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