David Bremner <david@tethera.net> writes:

> Several people have observed that this is surprisingly slow, and we
> have a proposal to add tagging into this code path, so we want to make
> sure it doesn't imply too much of a performance hit.

On my SSD / 8th gen i7 / 32G RAM based debian workstation it seems OK,
with a max slowdown of 1.4% (mean of 5 runs). I'd like to see similar
figures for spinning rust and older CPUs. This is with Xapian 1.4.11;
ideally so would other comparisons.

|         | Before |  After | slowdown % |
| initial | 517.69 | 522.13 |        0.9 |
| mv      | 313.16 | 317.57 |        1.4 |
| mv back | 315.21 | 316.73 |        0.5 |
| cp      | 170.36 | 171.08 |        0.4 |
#+TBLFM: $4=100*($3/$2-1);f1

Raw data is attached for the curious