[sv1cec]

If I remember correctly, AWS is NOT performing any check of its own. The censorship check is done by vB itself, and all I do is make a comparison between the text before and after the censorship is applied. If these two do not match, then AWS issues a warning. So, I can't think that your speed is so much affected by AWS.

One thing that may affect your speed, is when a censored word is found, and AWS underlines that word, in order to create the record, which shows you the original post (how the post was, before being censored). This can be removed if you so want, but again, I do not think it is this, that slows down your system.