I understand that you have already used ‘parfor’, vectorization and want to further optimize and potentially reduce execution time. You can use external libraries or MEX files, for computationally intensive tasks that cannot be optimized further in MATLAB, consider writing critical parts of your code in C or C++ and compiling them into MEX files. This approach can significantly speed up execution. Also, use MATLAB's Profiler again after making changes to ensure that your optimizations are having the intended effect. Sometimes, optimizations can have unexpected impacts on performance.
For more information, you can refer to the documentation links below –
