Use single LinearConstraintProjection in ProximalProjection (#1409)
#2338
| Job | Run time |
|---|---|
| 22m 2s | |
| 18m 51s | |
| 16m 18s | |
| 18m 13s | |
| 16m 32s | |
| 19m 16s | |
| 16m 2s | |
| 15m 5s | |
| 2h 22m 19s |