There is a category of ads, with scrolling texts that show up pretty well, but delays the app screen refresh.
For example, if you click on a button, I believe the click is processed, but the screen will only show the result seconds late, or when the user makes another click.
If a stop watch is in the screen, it will not refresh every second, but by batches.
One example of such ads is online college (
cityu.edu). It is not the only one, there might be a way advertisers may configure such ads.
I have seen different ones, and all cause the same problem.
I fixed the problem of clicks using touchstart and touchend, but the screen refresh is a huge issue.
Other kinds of ads, like graphic ones, do not affect my app.
I am developing with phonegap, and testing on a android tablet.