See here for a detailed overview of how often Coinlytics widgets update, see here
On iOS and iPadOS, widgets update at certain points in time determined by the underlying operating system.
If you glance at a widget twice within a couple of minutes you may not see the price change - simply tap on the widget and the app will come to the foreground and update the price - both in the app and on the widget itself when you return to your home screen. This delay is actually by design - iOS widgets intelligently grab data in the background so as not to drain the device battery.
If you need to be constantly checking prices on a sub-minute level there are other more powerful trading-specific apps that can give you that true real time data and Coinlytics may not be the best solution for you.
For people who want to check the price of their crypto as they unlock their phone throughout the day and see their homescreen, Coinlytics is the perfect way to do that with nearly unlimited ways to customize how you see that data.