Optimize importer-offline (batch writing + more parallelism)
#2883
| Job | Run time |
|---|---|
| 2m 54s | |
| 2m 42s | |
| 2m 31s | |
| 3m 13s | |
| 2m 30s | |
| 2m 52s | |
| 2m 47s | |
| 2m 50s | |
| 2m 50s | |
| 25m 9s |