I noticed that (on my Ubuntu, and also on other Linux distributions, e.g., Debian) small animated images eat CPU time. When I open multiple Firefox tabs, the CPU raises to 100% and it's because of then small loading images in top of each tab.
There are so many examples of this effect (high CPU usages for loading images). When connecting to a wireless network (i.e., wireless icon is animated), and animated gifs (ajax loadings) in web pages, etc.
Can I solve and prevent this problem? (e.g., like with an OS graphic configuration option)