It made the point about being able to distinguish fine colour gradients virtually impossible to verify - the background kept changing.

Also, it slowed site scrolling to a crawl on this reasonably beefy desktop machine.

I don't think it wouldn't have been so bad if it was slower, like clouds on a not very breezy day. As it is, it felt like it was trying to hypnotize me.

Author here. You're completely right. I did for fun, not because I "should."

I'm not a designer; just someone who enjoyed playing with SVG and SMIL to make a subtle background effect that I liked.

You can turn off the animation with the menu at the bottom right. Apologies to everyone for burning your CPU cycles so needlessly. Just turn it off if you don't like it.

Agreed. There's a control in the bottom right corner to control the speed of/stop it, but the animation shouldn't be there to start with.

The cpu utilisation of that page is quite impressive.