downgrade giac to optional #4862
| Job | Run time |
|---|---|
| 1m 38s | |
| 2h 6m 29s | |
| 13m 27s | |
| 1h 30m 39s | |
| 9m 9s | |
| 1h 23m 45s | |
| 13m 44s | |
| 1h 24m 48s | |
| 15m 5s | |
| 1h 26m 41s | |
| 15m 13s | |
| 1h 8m 6s | |
| 1h 18m 20s | |
| 1h 12m 9s | |
| 1h 25m 37s | |
| 1h 13m 29s | |
| 1h 27m 53s | |
| 1h 35m 26s | |
| 1h 21m 55s | |
| 1h 18m 21s | |
| 1h 17m 18s | |
| 2h 30m 47s | |
| 2h 30m 46s | |
| 3h 15m 19s | |
| 3h 31m 47s | |
| 1d 10h 7m 51s |