That is true to some degree for memory but not at all for CPU usage and only to a much lesser degree for network usage. Also, the entire architecture of browse

That is true to some degree for memory but not at all for CPU usage and only to a much lesser degree for network usage. Also, the entire architecture of browsers is very much geared towards running tons of totally unpredictable crappy adds. I don't think the multi process architecture most browsers use nowadays would have come to pass without crashing Flash adverts.