const path = "/some/very/long/path/to/a/directory";
const root = "/some/very/long/path/";

console.time("slice");
for (let i = 0; i < 1_000_000; i++) {
  const result = path.slice(root.length);
}
console.timeEnd("slice");

console.time("replace");
for (let i = 0; i < 1_000_000; i++) {
  const result = path.replace(root, "");
}
console.timeEnd("replace");