I have a ‘yellow plug’ connection, and until relatively recently (say the last few months or so) this was no problem – I could play and save everything just fine.
Recently though some games I just can’t play (e.g., Clicker Heroes, loads but I never see the Play button, same with Pool Live Pro), and others don’t save my progress (e.g. Decision 3, Royal Squad) meaning if I shut the browser I have to start again. Both issues seem to be present with Chrome and IE, so it is probably my network. I can understand multiplayer games not working if they need a connection to a third party server on ports I don’t have open – but why the (seeming) inability to save progress locally for some games?