The Speed Dial might take some time to load depending on how much pages you put there. If you have lots pages in the Speed Dial (stash too), you can expect it to load slower than usual. I don't know how many pages you have there, but it could be the reason... Also, the browser itself may take time to respond each time you open it, depending on your hardware.
Found the problem! With "Hardware Acceleration" set to On Google Maps appears incorrect.
If I disable "Hardware Acceleration" the site is shown correctly!
But is strange! until opera 22 (inclueded) no problem!
I don't know!!....