Mostly issues of laptop battery life and heating. I have a five-year-old laptop that can usually last about 3 hours when browsing the internet. Usually, that browsing consists of spikes of CPU activity when rendering the page, then low CPU activity when scrolling through. However, with that animation, the CPU activity stayed consistently high. This is enough to make the laptop uncomfortably warm and increase the fan speed, providing noise.
It isn't something that makes the site unusable by any means, but it is something that gives an annoyance without a benefit to me.