It's not true. It starts reloading because the WebKit processes crashes. Either by a hanging page (which asks you to force reload, en then: kaboom), or by opening too much tabs, or by opening a few tabs too fast if you already have a lot of tabs open. It is very annoying. What's even more annoying is that OSX and Safari is swapping anonymous pages, pages you are actually using, to swap while there is plenty of available/inactive memory free. And another annoying one is that when flash player crashes, it is not restarted untill you quit and restart safari (you'll get a black box instead). All this stuff is really really REALLY annoying me.
APPLE - FIX IT.
This stuff should have been fixed a year ago. I'm really thinking about going back to FreeBSD as I only switched because stuff on OSX always 'just worked' for me (no mess to get wifi to work etc). And since Lion this is not true anymore: wifi is unstable, safari starts refreshing/hanging and not restarting flash, the paging algorythm is HORRIBLE, MIDI is seriously broken, mtmd/mds does not play nice when you are doing heavy IO and needs to be manually disabled/tweaked so it doesn't interfere with your work, ... can you tell all this stuff is really annoying me???