The length of a post has nothing to do with the speed of the site. Its all just numbers.
When you click on a thread all the server knows is what thread and post you want so its not searching the actual thread text and scrolling through it all. What its doing is searching the database for (example) "t=88578" which is thread number and "&page=2" which is the page number.
At times when the site is busy it may lag a bit from people using "search" etc. but not to worry, we are working on a few things to optimize the speed of the forum and actually over the next few months we will be restructering the servers so it will be even faster than you have ever seen. so alls good.
Also in regards to people bashing the chat threads. I recommend that if you dont like them just dont go there. As is the case with any other thread/forum.
The site is not only for information but for fun too... so enjoy yourselves and let others enjoy themselves in whichever way that may be.... Of course within the rules of MTF