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ChUIMonster
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You want the memory to be as close as possible to where it will be used. That "shortens the path" when data is accessed. Aside from on-chip caches the closest place to put memory for use by a Progress application is the -B buffer pool. Then comes the OS filesystem cache. Internal SSD is fast compared to rotating rust (and dirt cheap compared to a SAN) but it is also 3 or 4 layers of indirection away from the action. External SSD buried in a SAN device is about as far away from the action as you can get without sending a tape offsite via carrier pigeon.
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