Execution time of SQL should be the same in the Editor as in the Schema Browser. Please read this post for a possible explanation of why Editor is taking longer and what to do differently to make it fast.
We have no utility for migrating your saved Schema Browser queries to the Editor. But once you run them in the Editor, they'll be saved in SQL Recall (hit F8 to open that) so you can quickly recall them there.
You can export data to Excel by right-clicking in the grid and choosing "Export Dataset". I don't know what you mean by migrate the SQL to Excel.