For me, with scripts completely disabled the website is quite a bit faster, similar to what it used to be like (usable again!). It also seems completely functional, which I guess is the advantage of relying so much on css. All forms of infinite scrolling are gone as well.
How many of the 600,000+ FTers do you think know about CSS, much less how to disable scripts etc, just to get an IBB to function properly. The onus should be on the IBB to provide a smooth, functional BB that will enhance/complement the content - not create an 'enhanced' version that is a piece of pooey that's causing people to post less , consider looking at other BBs or just subscribing to the various bloggers & leaving FT behind.