Optimize importer-offline (batch writing + more parallelism)
#3658
| Job | Run time |
|---|---|
| 2m 33s | |
| 2m 39s | |
| 2m 51s | |
| 2m 55s | |
| 2m 31s | |
| 2m 43s | |
| 3m 4s | |
| 2m 39s | |
| 2m 45s | |
| 24m 40s |