163MB was just the rest of the file that needed to tranfser, the file itself was around 1GB. Okay but if this can't be improved, then is there any SSD that can do this faster?
No.
This is simply the way things work.
ALL storage devices are slow when copying from one part of it to another.
Your current drive is PCIe 4.0 x4. Currently, there are not any "faster" devices.
If you were doing this with any other drive, it would be slower.
And this highlights the main marketing fallacy with the big numbers posted for SSDs.
An SSDs real benefit over HDD is the near zero access time. ALL of them benefit from this.
The big sequential read/write speed (top line on CDM) for PCIe 3.0 and 4.0 drives is only really applicable when copying a large single file between 2 such devices.
There is nothing wrong, there is nothing to fix, there is nothing to be disappointed with.