texting slow

I love this phone! It's simply awesome! Its just so much fun to use, that you can't help but push it to the limit! So of course I hit a snag...

I'm an average text user and I'm not sure, but I think I've got a problem...

Sometimes when I'm texting, I notice a delay in the typing and the letters coming up in the field. Like my fingers are typing too fast, but I know they aren't, but it takes a second or two delay for the letters I've typed to hit the field above. It's as if the phone's backed up or something. I was just wondering what could be causing this and if anyone else is having this problem. I restored my phone last week at the store, but it's still going on. I decided today to try and delete a bunch of messages and conversations, hoping that the program is just using too much memory or something. But does anybody else have this? It gets really annoying...