I use Firefox 15 on Ubuntu, with quite a lot of addons. I watched "top" whilst I opened the page, and I saw Firefox quickly consume 30% of my RAM (I have 8GB).

I use Firefox 15 on Ubuntu, with quite a lot of addons. I watched "top" whilst I opened the page, and I saw Firefox quickly consume 30% of my RAM (I have 8GB). Once the page finished loading, it dropped back down to 5%. The page works fine for me, but I imagine it would suck if I had less RAM. I tried it in Chrome too and it never even got as high as 5% memory usage. I'm willing to bet that the developers who made this page, and the managers who approved it, all have plenty of RAM in their machines.