Here is why I'm still using Relearn 5.25.0

[Kotsiubynskyi]

I like Relearn very much since I started using it in 2024. But unfortunately there was a release of this theme last year which broke its performance (or at least scrolling performance). It's 5.26.0 which broke it.

Please, take look at my web-site using 5.26.0 (for now - for problem demonstration): https://solderkid.netlify.app/lesson3/
And try to scroll down the page with mouse middle button pressed and you will see everything. Scrolling performance is now very bad, that's why I stick to 5.25.0 where scrolling performance is super smooth. And actually it's not only about scrolling with mouse middle button. Scrolling with vertical scrollbar is also jaggy with 5.26.0 but because of the way you scroll with it it's less noticable.

Does anyone know which exact commit in 5.26.0 release broke it? Personally I use mouse middle button scrolling very often. And the more complex web-page is the more scrolling jaggy which makes me feel like whole website is written bad.

[Kotsiubynskyi]

One more problem is that now when scrolling my CPU (i5-1135G7) goes crazy up to 90% CPU load in Windows Task Manager. But with 5.25.0 it's not more than 30% of CPU usage. So there was definitely some serious performance degradation in 5.26.0

[McShelby]

I currently have no access to a mouse to verfiy this, but you could help out with a few things in the meantime:

• which browser are you using?
• can you reproduce it with any page of the theme documentation at https://mcshelby.github.io/hugo-theme-relearn/ - if yes, which? Hint: A rather complex and long page would be https://mcshelby.github.io/hugo-theme-relearn/authoring/markdown/index.html
• could you give me access to your site's repo?

[Kotsiubynskyi]

I use Chrome. Yes, your page is also sluggish. Do not you feel it?
I checked Chrome performance report with both 5.25.0 and 5.26.0 releases. And with 5.26.0 there are a lot re-rendering done on scrolling while 5.25.0 version is idling most of the time while scrolling.

[McShelby]

At first glance by browsing thru the changes I would suspect this line to be the culprit: dc65242#diff-cd91e6463f73511d1aeb6efba8d1b88b80e818d7b8d5f0369def0e864817e292R1175

If you're really desperate, you could remove the whole scroll event handler and see if it is still an issue.

The solution in this case would be to implement some other kind of throttling.

[Kotsiubynskyi]

I am not desperate, it's not critical for me.

Thanks, you suggestion worked and now scrolling is much smoother and my CPU doesn't cause laptop fan to spin out.

[McShelby]

I'll see how to improve this. Hopefully I can reproduce this tomorrow.

Actually no other users reported degraded performance in the past. And if I fell bothered (which wasn't the case here), I create an issue entry here and fix that stuff.

I can not fix stuff I am not aware of 😄

[McShelby]

Further discussion in #996

[McShelby]

Fixed