3 Technical SEO tips for SaaS products to rank higher now!
Read a curated list of technical SEO tips with examples for your SaaS products from SEO experts and SaaS Founders to grow your SaaS.
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Izzi Smith shares
What's the issue with unused JS?
- the browser needs time and resources to process the script, with no benefit for the visitor.
- mobile users may have to use extra data when accessing the page
- it's commonplace, as many files or scripts might be bundled together
- It's basically really detrimental to your performance, Core Web Vital scores, and therefore the general UX of your site, so better tackle it!
Let's take a look at a couple of things you can do to improve this issue, or better communicate some causes.
Clean up the unused , update the old, and find overlaps to merge. If you have a big team working on the CMS, make everyone provide a case for theirs.
This can be a big win driven by SEO / content teams. Identify unused JS that could be dealt with accordingly. You can do this in Dev Tools. Just head to More Tools > Coverage > & go!
This shows which scripts & CSS files were not critical or were unused during the page load. Of course, some JS is important after the page loads and when users interact with elements. (note: "some").
Choosing the file and visiting the "Source" tab shows you the unused lines of code for review, but your developer can assess this best.
(code that's not needed for the page's main functionality.) you can mark the script's URL with "defer" or "async".
Unless there is a specific reason not to, all third-party scripts should be loaded with either defer or async by default.
A good solution could also be bundling & code-splitting. This technique "splits" the code, cleans it up, & creates neat bundles for critical and non-critical code.
Some well-known bundlers are Webpack, Browserify & Rollup (but best handled by web dev specialists!).
@Ryte_EN to crawl sites with Lighthouse and then understand the templates with heavy scripts, checking a few manually to uncover what could be optimized (e.g. deferred or bundled/split), and then creating my priority.
This speeds up the analysis *massively*.
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