Over at Keylime Toolbox, we have a feature that lets you test filter patterns against your query data. To make it “fast” we limit the data to the most recent day of data. But this can sometimes be 50,000 or more queries. So when rendering all those into a list (with some styling, of course), it would make the browser unresponsive for a time and sometimes crash it.
After hours of debugging and investigating options, I finally fixed this by limiting the number we render to start with and then adding “infinite scroll” to the lists to add more items as you scroll.