Parallel computing can speed a solver, especially if the objective function is time-consuming. You must have a Parallel Computing Toolbox™ license to use the built-in parallel computing capabilities of Global Optimization Toolbox.
How Solvers Compute in Parallel
How solvers distribute work for parallel computing.
How to Use Parallel Processing in Global Optimization Toolbox
Direct your solver or hybrid function to use multiple processes.
Minimizing an Expensive Optimization Problem Using Parallel Computing Toolbox™
Example showing the effectiveness of parallel computing
in two solvers: fmincon and ga.