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rswindell authored
(ctrl/node.dab) is constantly closed and re-opened for every non-locking read. This is really slow across network file systems and unnecessary, so use a similar optimization as the C++ sbbs_t class where the file can (and normally is) left open across multiple consecutive reads. Create/use opennodedat() function. Uses the new CLOSE_OPEN_FILE() macro from xpdev/filewrap.h.
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