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Practical Linux performance guide focused on MCP—Memory, CPU, and Processes. Install observability tools and capture a baseline, then apply targeted tweaks: CPU governors, IRQ balance/pinning, optional core isolation; swappiness/dirty ratios, THP=madvise, NUMA binding; raise ulimits and tune cgroups; choose I/O schedulers/read-ahead, enable TCP BBR. Persist via tuned/sysctl.d/systemd, change one knob at a time, and roll back safely.