Remembering weights between consecutive regridding operations

Given two fields `fld1` and `fld2`, if I use for example `regrids` twice, it seems to take the same amount of time the first and the second time.

```python
fld3 = fld1.regrids(fld2, 'conservative')
fld4 = fld1.regrids(fld2, 'conservative')
```

So I am wondering if `cf` is able to remember the weights from the first time it did the regridding in order to make the second time faster?