Reminds me of the time I had to make an interface for a set top box by Deutsche Telekom. It was severely underpowered and I had to work with some very quirky browser. I think the browser was based on Internet Explorer.

It was super slow and couldn't handle anything asynchronous. Which meant that it would lock up for even the simplest operation. And they insisted on their buttons having button down animations. Which meant that I had to slow down the incredibly slow machine artificially so that you could see the animation. And it wasn't enough to slow it down just for the animation duration. You had to give it some extra time because it was so damn underpowered. I think in the end a button push took a whole second extra time.

And it was still faster than what they had produced themselves before that, even though their thing didn't have any animations.

The worst was that those machines actually did have a fancy hardware accelerated interface one could use. But for some reason they weren't ready yet for that. So everything I had done was just a placeholder anyways.