Last weekend we had a chance to fine-tune the performance of a website that we started over a year ago.
It is a job board for Software D...
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It looks like you could use some more webpack dynamic imports to modularize your output js/css further down - with http2 it should help a lot. Maybe even think about separating "shell" css from the details, and load details asynchronously. This could make a big difference in that big css.
If you are brave, play around with purgeCSS - Ive found it an amazing thing if it works :)
Also, doing metatag dns prefetch to your CDN domain could also speed things up - ssl handshakes can slow things up a bit.
It looks like your fonts have all the possible characters in them (19KB is pretty big) - you might want to check out this article - florianbrinkmann.com/en/glyphhange... - i found this recipe to work wonders on fonts i used in one project:
before: 19KB
after: 5KB
Additionally, instead of loading them in the main CSS, inlining them into
<style>in body, makes the request starts earlier, hence minimizing FOUT.Also, normally i wouldnt even mention this, but i think this is one of those rare cases where looking at the DOM depth and size could be a good investment if you look into performance issues.
Im a big fan of svg, but im not entirely sure that copying whole SVG tree every time its needed on the map is the way to go - if there is a big DOM tree with a depth, light png might be first easy step to make it a little bit shallower. But its very possible that with react and all that, its possible that your wiggle room will be small.
Hey Paweł,
Thank you for the detailed suggestions, appreciate a lot!
Addressing your points:
Fonts: ouh yeah, you can strip it down to characters you need - its very effective.
SVG - inlined svg is just a bunch of xml tags, so for 20 (even the same icons) your dom has 20x copy of that xml structure. I presume tiny png would be much flatter and i saw that you dont zoom/animate/manipulate icons on the map, so its less of a sin to migrate. Second option (probably better) would be to use svg symbols and use tag, to not duplicate the tree.
Thanks for sharing, duely noted ;)
I'd recommand you add some OpenGraph metas to your website (pretty cool !), in order to improve sharing.
And maybe add a filter for remote working/freelancing, i'd be interested :p
Cheers !
Thanks for the suggestion.
For OpenGraph - already added some tags + Twitter card tags + JSON LD for Google.
The filter for remote work would be nice, unfortunately there is only a few companies (I mean like less than 10) in Switzerland that are fully open to remote work.
Thanks.
I'd still enjoy to see those companies haha
Maybe later
WebP for images is cool.
I just prefer to drop iconfonts if possible or replace with inlined
<svg>, depends how you design tho.We need to finally look into WebP :)
I have been using it, and is like 25~50% size of JPG depending what requirements are,
even more my web framework has builtin support for WebP.
Nice post!
Thanks!
Can we rely on such conclusion?
Have you tried server-side rendering, this is what helps Angular get up to speed. That's all I can think of considering all great ideas in comments and your post
that good to read
Is the preload method above good for service worker and main js file?
I recommend you to check: developer.mozilla.org/en-US/docs/W...
Generally it should worker with the service worker, too.
Preload is mostly useful for resources that are loaded later in the chain.
In our case, the /api/jobs endpoint is called after the JS code is downloaded and processed, so it makes sense to start loading it earlier.
Chrome's Lighthouse audit plugin suggests:
Great site though!
Thanks for the suggestions.
Are you using the built-in Lighthouse performance audit in Chrome?
Asking, because On My Machine™ it does not show anything about minifying JS (should be done by default in CRA npm build)
As for images - do you mean jpgs or maybe some of the new formats like WebP?
And the last thing - CSS, do you know any straight forward solution here for Create React App?
Which are your preferred tools to monitor performance over time?