Unfortunately, the most frequently asked question I receive as madKast's evangelist is is madKast slowing down my blog?
The answer is a decisive NO.
The best way to respond to this fear is to explain to bloggers that any seeming slowing down of their blogs from madKast is not real but perceived. Why?
madKast does not load until ALL, of the content on the page has already loaded (after the "DOM," for the technically-inclined among you). madKast was specifically designed not to slow down the blogs we're on so our widget is actually the last thing on the page that loads.
I think the key issue that has some people confused is that often one may see several seconds of "loading madKast.com" at the bottom left corner of a browser when a page loads, but all that means is that madKast is actually waiting for everything else to finish loading before it even begins loading.
Most of the time, it only takes 100 to 400 milliseconds (i.e., well less than one second) for madKast to load -- and that is only after everything on the page is already loaded.
Hope this helps to clarify things.