computing lastPrintableIndex only once instead of checking in every loop
#2585
| Job | Run time |
|---|---|
| 1m 43s | |
| 1m 6s | |
| 46s | |
| 1m 32s | |
| 1m 15s | |
| 1m 1s | |
| 2m 15s | |
| 9m 38s |