A possible cause of slowness could be large items to filter, you can create a simple filter function that hides all items that don't match the filter criteria.
Also, I noticed you have a good idea, but the contents of the page is too vague, if you are looking beyond just having a page, but also want your page to meet your desired conversion goal, you should add more converting sections to your page to build trust. People don't buy wonderful ideas, they buy trust & you can fathom that in your page for it to be effective.
