Three things to try...
Export as a VIDEO FILE, instead of to Drive. Mp4 format at the auto-detected resolution might be good choice. Then, apart from Videopad, open Drive and upload your file.
In Videopad, under OPTIONS|EDITING toggle the "accelerated hardware" choice to the other state, and see if that speeds up the export.
When using Videopad, shut down background programs so the PC can concentrate on the task at hand. Video editing is resource intensive.