Javascript shift vs slice

In javascript to remove 1 element from beginning of an array shift and slice functions performance vary with size. Shift time grows more than that of slice. After 250K change is significant. Showing that shift should be preferred over slice.



Nodejs Code:

var r;
var arr = [];
var n, s = 1;
var t, t1, d, d1;
var max_size = 999999999999999;
console.log('size, shift, slice');
while (s < max_size) {
  n = s;
  while (n) {
    arr.push(n--);
  }

  t = process.hrtime();
  arr.shift();
  r = arr;
  d = process.hrtime(t);

  t1 = process.hrtime();
  r = arr.slice(1);
  d1 = process.hrtime(t1);
  console.log([s, d[0] * 1e9 + d[1], d1[0] * 1e9 + d1[1]].join(','));
  s++;
}

Results (in nanoseconds):

size shift Slice(1)
1 7138 2216
2 9384 2198
4 2675 1449
8 2253 1313
16 1958 1370
32 2285 1261
64 1999 1211
128 1996 1400
256 2244 1692
512 2541 2165
1024 2635 3240
2048 2904 5031
4096 3039 26260
8192 3263 53801
16384 5012 134611
32768 4576 275972
65536 148325 421068
131072 271896 598540
262144 528817 1213684
524288 1095032 2219610
1048576 2880932 5821282
2097152 7697251 24937937
4194304 14904224 42081247
8388608 29666453 87721218