I think the lava lamp effect is cool. The perf issues can and will be fixed.
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. :)
(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.
Mac+Firefox users are probably in your customer base. Listen to the feedback.