http://www.techcrunch.com/2009/06/04/the-short-lifespan-of-the-iphone/
"For the past several weeks, I’ve been noticing something about my iPhone: Severe slowness. I put it sleep and wake it back up, clear its memory (with an app), restart it and even sometimes manually reboot it — some of these methods alleviate the symptoms, sometimes. Other times, I have to just deal with it being too unbearably slow to do much of anything, including the basic phone functionality like placing a call or sending a text message. And sometimes the iPhone gets really hot, even when it’s in its sleep state, and I’ll turn it back on to see the battery mostly drained.
"And while I’m not above simply complaining about my own problems with tech, I’ve talked to a lot of other people recently who are having the exact same issues. I’m not sure why this is happening. Some people think it’s because the device has been around for about a year now, and a lot of us have loaded a ton of apps on the thing. I should probably do a factory reset of the device, wiping it on iTunes. But as anyone who has done that before will know, that’s a big pain in the ass. (((Sad but true, and... wait a sec... Could it be that wily experience designers actually *plan* to inflict big pains in the ass? Read on!)))
"So my solution is an expensive one: Wait for the new iPhone. We all know it’s coming, it’s just a matter of when. There still seems to be some debate if Apple will actually announce it at the WWDC keynote on Monday (which we’ll be at), or if it will use that event to focus on OS X Snow Leopard and the new iPhone OS 3.0. But seeing as Apple already had an event for the new iPhone OS, I think we will see the new hardware unveiled at the event, just like we did last year. Though I suspect it won’t be available in stores until later on, probably July, once again.
"The new hardware, which is believed to be significantly faster, will solve my issue — for now. (((