Use reduction for max wave speed computation in max_dt
#11024
| Job | Run time |
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| 45m 6s | |
| 41m 29s | |
| 43m 0s | |
| 34m 49s | |
| 26m 0s | |
| 34m 58s | |
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| 37m 42s | |
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| 27m 11s | |
| 46m 47s | |
| 46m 49s | |
| 9m 26s | |
| 19m 38s | |
| 34m 23s | |
| 20m 33s | |
| 23m 2s | |
| 46m 48s | |
| 16m 34s | |
| 23m 55s | |
| 34m 6s | |
| 31m 1s | |
| 19m 13s | |
| 14m 6s | |
| 22m 19s | |
| 1s | |
| 13h 25m 24s |