Just get rid of it entirely. The visual flair is not adding any value. It's a performance drag, highly distracting, and serves no useful purpose whatsoever. This "trend" in modern web design is truly infuriating.
I think the lava lamp effect is cool. The perf issues can and will be fixed.
(Your site works fine on my computer. The effect is disabled and it's not a problem.)
There's clearly bugs where it's enabled where it shouldn't be, and that's certainly an issue, but the comments here make it clear that it gets disabled automatically on lower-end devices.
From my perspective I agree with a lot of the other commenters - it’s just design for design’s sake. It’s an expensive way to add minor visual flair that heavily degrades the experience for a sizeable number of users. In terms of value provided to the user: it’s basically zero, or often worse than zero.
Personally, it feels over-designed, which the stretched font for the headings really reinforces. I’d drop the shader, re-evaluate your font choice for the headings, and focus on layout and readability a little more - using the site on my iPhone feels really cramped and like the whole page is getting cut off on the right-hand side constantly. I can’t scroll horizontally to see the rest of the code, for example.
I do like the little text-flicker/flipboard animation on the “keygen” logo though. That looks clean and well-suited to the theme of the site.
And it may be over-designed. It was my first foray back into design since switching careers to programming about 10 years ago. Maybe I took it a bit too far? Felt good to stretch those muscles, though. :)
Mac+Firefox users are probably in your customer base. Listen to the feedback.
The animation itself looks fine, its slow enough that it doesn't feel distracting. Just a bit of flavor.
Its mostly just a few calls to a cheap noise function and no footguns I can see. Also hurrah for dev tools and open text formats! If you're looking for better performance, it looks like the noise could be precomputed (the same blob always gets the same noise)". Might be faster, might just hit more bugs.