Several tools, that are really,
really helpful for lots of tests. I use these all the time, and they are incredibly helpful.
- Google speed score: showing how well a page is optimized for speed, and all the details needed what can be further optimized.
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Google mobile friendly test: much more tests, including if the page has elements that are blocked that might prevent rendering
- Webpagetest.org: the best way to test how it looks for users in a different country, with many of the same metrics as other tools
- KeyCdn website speedtest to test from multiple locations globally