Assuming you are a NetSuite administrator, you can have a look at the customization tab and navigate to scripts. In that page you will see all the record types that you have and next to that you will see how many scripts and workflows are associated with those records. Look for those that have the most scripts and workflows – this will be a great place to start.
The Suite Cloud Performance monitor will also show you data that can guide you in the right direction of what needs to be improved.
What we could help with is to analyze your setup and try to find which scripts and workflows can be combined to receive the same result.