Check one thing at a time
Start with another site, then another device. If both fail, look at the shared connection before changing the app.
Small network notes
Keep the connection simple.
Practical reminders for when a page loads slowly, a download stalls, or a network changes underneath you.
Watch the whole transfer
A quick connection does not guarantee a fast download. Measure a complete file before judging the route.
Keep a fallback
Record the working route before testing a new one. Small reversible changes are easier to diagnose.