Click the Tools menu > Job Preferences > Work Parameters to open the Work Parameters dialog.
The Switch off selection synchronization between views or tables option optimizes performance when you are working with large structure models. For smaller structure models, it is very convenient to work without selecting this option. When this option is cleared, tables reflect the bars or panels that are selected in a view, and objects that are selected in the view are entered automatically to the selection fields in the load table. However when working with large models, automatic and frequent refreshing of the table contents or view can slow performance. To avoid performance problems, you should select the Switch off selection synchronization between views or tables option. When this option is selected, a selection is not transferred from the view to tables, and lists of objects selected in the view are not transferred to the load table.
The Save results in external file: *.RT_ option lets you save results in a separate binary file. Saving results in a separate file accelerates the process of writing the file to disk as well as reducing its size. Select this option for projects with a large number of elements or when using a type of analysis that generates a large number of results: seismic, spectral, time history analysis, and moving load analysis. The results file that is generated is given the same name as the data file, but with an RT_ extension. The RT_ file is generated in the same folder where the RTD file was saved. Also a RTW format file is created with temporary system data that you can delete after you exit Robot. You can save results for nodes, bars, planar finite elements, and the results of dynamic analyses in an RT_ file. To reduce the size of an existing RTD file that has results, you must use Save As with a different file name with this option selected. When you open an RTD file, where the results were saved in a separate file, Robot looks for an RT_ file. If the RT_ file is not found, a status message of None is displayed.
The Maximal number of generated combinations option specifies the maximum number of combinations generated automatically during generation of code combinations. The default value is 64,000.