Several years ago, along with some cofounders, i created a Hearthstone website / database (hsreplay.net). If you look at the card database it's incredibly fast

Several years ago, along with some cofounders, i created a Hearthstone website / database (hsreplay.net). If you look at the card database it's incredibly fast once loaded because all the filtering and displaying etc happens clientside. It downloads a 25-something megabyte JSON (which compresses extremely well), cf. hearthstonejson.com. Downloading a big JSON file locally is underrated. I implemented the exact same strategy on https://overframe.gg https://overframe.gg, a Warframe database. It allows a fantastic user experience ... the tradeoff being the slow loading time (which is invisible to most people on good connections). Overframe was a SPA though and had to lose the approach on most pages because of SEO. The usage were too different. Before that every single page on the site was clientside and available immediately after initial load. For a tool though, especially one that relies on user input (and thus will load in the background before your user starts interacting with it), it's a great approach as long as your data is somewhat bounded.