Even on your initial attempt, I got these results:

```
Mem::replace based approach took 2657210
Clone based approach took 2983794
```

I’m pretty sure that 2983794 > 2657210… Also, this makes sense, the clone approach has to copy the buffer each time.

On a second attempt I got:

```
Mem::replace based approach took 3652959
Clone based approach took 3020418
```

Hmm, mixed results. Time for a bit of number crunching!

Here is the test I ran. I ran it on my pc, as it would’ve taken ages on the playground, and even then took alot of my cpu:

I guess I should’ve optimized beforehand! Anyway, the results to that are:

```
On average clone took: 9968
The median clone took: 9910
On average mmcpy took: 7280
The median mmcpy took: 7276
```

So essentially ~~they are the same~~ clone is slower.

(Note that the above results are in milliseconds)

#### Edit: Whoops I misread my results, they are actually *not* the same.