The advanced reply box too ... no change in font size at all. In fact, the font color was made one shade darker!
DaniWeb does use slightly more resources ... some of the style elements (such as curving the corners of boxes) is now done client-side via JavaScript instead of via CSS. In other words, whereas before there were dozens of little images that needed to be downloaded with each page to give the curved corners effect, now no images are necessary and JavaScript just does the work.
What I found, however, is that once your browser caches the JavaScript file, things get faster quite quickly. Also note that there are all new images throughout the site. Therefore, all of the images you have cached (which you're accustomed to the time it takes to use) will need to be redownloaded. You should definitely give it at least a day or so of use before you start comparing speed differences due to browser caching.
I did put effort into reducing the amount of JavaScript there is. If it is still a problem for a large number of users, I will consider adding an option in the control panel to forfeit curved corners for users with slow CPUs. I really don't think this will be necessary though.