Is this too heavy?

I’m working on a portfolio website and have an animation for my introduction page. But it seems to go reaaaally slow on a older pc (AMD 750Mhz). On my AMD 2600+ it’s acceptable. I want to know from you guys how the animations run on your computers.

And also, do you guys think it’s necessary to keep into account the users with slower computers? (not that that’s are my target audience)

Thanks a lot!