Why My Home Internet Was Suddenly Slow — And How I Found Out It Was the ISP

Recently I ran into a frustrating issue: my home network became painfully slow. Websites I visit every day — like Google and GitHub — were loading inconsistently, sometimes not loading at all. At first, I thought something was wrong with my router or my local setup. But after a series of step-by-step tests, I discovered the real culprit: my ISP.

This post documents how I diagnosed the problem, what I learned about ISPs and connection types in Australia, and some tips you can use to avoid the same headaches.

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