perf: use more lengths() and data.table::setattr() (#1412)
#1339
| Job | Run time |
|---|---|
| 6m 3s | |
| 6m 28s | |
| 12m 31s |
lengths() and data.table::setattr() (#1412)
#1339
| Job | Run time |
|---|---|
| 6m 3s | |
| 6m 28s | |
| 12m 31s |