I’ll share an experience.

I have a mixed linear optimization problem.

When I use a feasibre solution (MIPstart), sometimes CPLEX performs worse than if I let it determine an incumbent solution automatically.

Sometimes when I don’t use MIPstart, CPLEX doesn’t even determine an integer solution.

```
for i in I
for t in T
set_start_value(s[i,t],1)
end
end
```

What is your experience in this matter? Fix variables and ensure an incumbet solution or leave CPLEX determine automatically?