I'll take "not reading the post" for $1000 Daily Double, Alex My HOSTS file is about 4mb due to having a few million IP addresses in it, my HOSTS resolve takes more than a few seconds, personally I don't mind waiting a few seconds for the server too process a per-user list. PornHub has this exact feature and their servers seem to handle it just fine. Another thing that may be worthwhile is having a NexusMods browser extension with these features, since you mentioned frontend. Reddit has RES, which does all sorts of stuff client-side rather than serverside. As many note, Reddit's serverside handles are just a vast fustercluck. Pornhub makes a lot more money than the Nexus does dude