Reduce memory allocations

Use the arena package to allocate memory in bulk and free it manually, bypassing the garbage collector for short-lived, high-volume allocations. This reduces GC pauses and total memory churn by returning memory to the runtime immediately after use.

import "arena"

func process() {
    a := arena.NewArena()
    defer a.Free()

    // Allocate many objects in the arena
    items := arena.MakeSlice[int](a, 0, 10000)
    // ... use items ...
    // Memory is freed instantly when a.Free() runs
}

Think of this as renting a block of hotel rooms for a party instead of booking individual rooms for every guest. You get the whole block at once, use it, and return it all at once when the party is over. This saves the hotel (the garbage collector) from having to check on every single room individually, making the cleanup process much faster.