I've noticed this for a few days now. The specific banner ad for cricket wireless completely grinds my android phone to a halt when it pops up as I'm going through subeta. To the point I have to close out the window completely and open a new one to connect back to the website, while hoping the same ad doesn't pop again as I reload the site. Don't know if it's just my phone in general that has problems with it or if it's a common problem.

Actually I've not seen that particular ad in a while. It had animated snow and a green background.