docs: add guide for troubleshooting slow connections to Flathub

docs/01-for-users/11-slow-connection.md

@@ -0,0 +1,26 @@
+---
+title: Slow connection to Flathub
+sidebar_position: 11
+---
+
+# What to do when Flathub is slow for you
+
+If downloads from Flathub are slow for you, this guide covers quick troubleshooting steps and how to report the issue.
+
+## Quick troubleshooting
+
+- Try another website to check if the problem is specific to Flathub
+- Test on a different network (mobile hotspot) if possible
+- Switch DNS to a public resolver (e.g., 1.1.1.1 or 8.8.8.8)
+- Reboot your router and try again
+- Try at a different time of day
+
+## How to report the issue
+
+If the problem persists, open an issue using our dedicated template:
+
+**[Report a slow connection issue](https://github.com/flathub/flathub/issues/new?template=3-slow-connection.md)**
+
+The issue template will guide you through collecting the necessary diagnostic information (network tests, Flatpak configuration, etc.) to help us investigate the problem.
+
+