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: Legacy CF cards can severely degrade performance. Always use Advanced Capability CompactFlash cards for maximum speed and stability.

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Older maintenance releases within the 15.x train suffer from memory leaks and physical port bugs. For example, earlier iterations like 15.5 or 15.6 occasionally drop active connections under high CPU loads or experience sudden hardware recognition issues (such as broken USB port paths). The 15.8(3)M7 build resolves these long-standing bugs, offering predictable uptime. 2. Advanced Security Hardening : Legacy CF cards can severely degrade performance