Won't load first page

Since Safari 6 appeared at roughly the same time as Mountain Lion, its hard to know whether this issue is down to Safari or ML. But anyway I'm finding very consistently that the first page I try to visit each day simply will not load! Just gets stuck with the progress bar barely advanced, and before even the page title appears at the top of the browser window. Doesn't usually beachball, just doesn't make any progress loading.

• Emptying the cache, relaunching Safari - or even doing both - makes no difference.
• I can hop across to another browser and load the same page with no problem.
• If I give up on that page in Safari and try another page, it quite often loads instantly; but then sometimes it won't load that one either - same behaviour.
• It happens on all kinds of sites, including ones I've visited successfully the previous day.

Eventually after several attempts, Safari starts working, and then it's perfect for the rest of the day. Then it does the same thing the next day .... etc.

I've reported this to Apple, so here's hoping it gets fixed. Is anyone else getting this?