Performance of splice about tracked-built-ins HOT 1 OPEN

const array1 = new Array(100000).fill(null);
const t1 = performance.now();
array1.splice(0, 1);
const t2 = performance.now();
const controlWindow = t2-t1;

const array2 = tracked(new Array(100000).fill(null));
const t3 = performance.now();
array2.splice(0, 1);
const t4 = performance.now();
const experimentWindow = t4-t3;

const deviation = 1.2; // 20%
assert.ok(experimentWindow < controlWindow*deviation)