Troubleshooting Slow Finsweet Filters: Seeking Solutions

Hey everyone! I am using the Finsweet Filters for this and it is really slow... As it is a personal project and I haven't had as much time as I hoped to devote to it this was the quickest solution I could come up with. Anyone know what the issue could be or have a better solution for me? TIA https://www.discoverarosa.ch/en/busfahrplan