I recently updated the presentation of some custom forums on my site, so that now they are using HTML5 as well as taking advantage of drop shadow and curved border css effects. Since making this change, however, a number of users accessing the forums from their iPod are complaining that typing in the textarea lags very badly, whereas it hadn't before I made the change.
The user agent of the affected iPods: Mozilla/5.0 (iPod; U; CPU iPhone OS 4_2_1 like Mac OS X; en-us) AppleWebKit/533.17.9 (KHTML, like Gecko) Version/5.0.2 Mobile/8C148 Safari/6533.18.5
Any ideas? It seems like it's obviously a browser bug, but it's a bug I'd like to avoid triggering!