So I took a look at the actual shader, and it really should not require anything powerful (decade old, worst-you-can-get hardware might struggle). A much more likely explanation (that the gp is alluding to but didn't explicitly say) is that the issue is related to your GPU drivers or related software. These are often buggy and/or hit a slow path for whatever reason. This is almost guaranteed to happen for some browser/os/hardware/driver combo (of which there are _many_) and you seem to have drawn today's short stick.

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.