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XLARGE memory model & generale performance

Hello community,

Using C166 / ST10 with last version of IDE (µVision V4.00a / C166 V7.00 / L166 V5.25)
We need between 100 & 200Kb data (composed of many structures / array), so we set XLARGE memory model.

General questions about this use :
Is it the best way ?
What's approximately the loss in code execution performance ?
Shall we must use the x... functions to prevent some bug from standard lib with segment boundary (e.g. xmemcpy from string.h) ?
Is there an other solution, because it's non standard functions ?

Thanks in advance.
JM

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