It's the output of a request the app makes to your provider's server, either through an Xtream Codes login or an M3U playlist link, both standard formats most IPTV apps understand. The server responds with every channel your account can access, grouped into categories, along with the streaming address for each one. The app renders that response as the scrollable list you see. Nothing about the list is generated by the app itself or hardcoded into it, which is also why the exact same install of IPTV Smarters Pro shows a completely different list the moment you log into a different account.

Player apps hold the entire visible channel list in memory while you browse it, and that memory use climbs with the count. Around 18,000 visible channels is roughly where apps on lower-powered devices start to slow down, stutter while scrolling, or occasionally crash outright. This isn't about your internet speed at all. It's about how many entries the app has to keep loaded and indexed at once. Hiding channel groups you never watch is a genuine fix here, not a cosmetic one, because it directly shrinks what the app has to hold in memory while you're browsing.

Use the category or group filters inside the app's settings to hide entire blocks you don't watch, rather than scrolling past them every time. Favoriting the channels you use most puts them one tap away regardless of how large the full list is underneath. Some setups also let you reorder categories so the ones you actually use sit at the top. None of this changes what your account can access. It just changes what the app has to display and hold in memory at any given moment, which is the part that affects performance.

A large number alone doesn't tell you much; duplicate feeds of the same channel, dead entries that never load, and heavy regional padding all inflate a count without adding anything you'd actually watch. A useful check is picking a handful of channels you actually want and confirming they load cleanly, rather than trusting the total figure on its own. IP4KTV publishes 54,000+ as a checkable number precisely so you can test a sample of it yourself during the trial instead of taking the figure on faith, and the same logic applies to any provider you're comparing it against.