Cache cpuidle names (was re-reading name sysfs every tick × cores) Cache CPU sysfs dir list + register cpufreq/throttle once Map for per-core prev lookups (was O(n²) .find) Dedupe meminfo/vmstat once per tick Cache iface speed/duplex/mtu/qlen (30s) Cache inotify limits (30s) Gate registerChart for IRQs, cpuidle, peardock mapped charts Remove leftover profile() stderr timers Cache os.cpus().length in docker collector Grow fd-cache buffer past 64KB for /proc/interrupts etc.