I am usually just a backend developer, but for a little reporting application that I built, I couldn't get the UI team to do a UI in the short time that I had t

I am usually just a backend developer, but for a little reporting application that I built, I couldn't get the UI team to do a UI in the short time that I had to build it, so I had it output some basic HTML. About 10000 list items. Rendered imperceptibly fast on my browser. Then because of $mandate, the report was moved to the team's standard React UI frontend. Now it takes 5 seconds to load and only gives you like 100 items at a time, so Ctrl-F is broken. Also, filter dropdowns somehow did not work until they fixed it, so it appears like the select tag was not fit for their design and they rolled their own.