1) It's UGLY. 2) It's HARD TO READ. 3) It's HARD to discern where content begins and ends. 4) The numbers for the message counts, likes received, etc on the left DO NOT ALIGN PROPERLY. The message count number is next to the likes received instead of message count. The trophy points number is actually outside of the box. 5) It's SLOWER THAN MOLASSES. 6) It's TOO WIDE for my 19" screen (I need to scroll left and right to read EACH line in EVERY post - Fixed-width pages are an indicator of POOR programming and INCOMPETENT programmers). 7) It's HARD to find the boxes to type in (borders are almost INVISIBLE). 8) It's CPU INTENSIVE (uses 100% of available CPU). 9) It's a JUMBLED MESS in the rules box at top (my name collides and partially overwrites the image in the same location). 10) The ads on each page overwrite part of the previous post instead of being in their own box. In fact, it is hard to tell where the post ends and the ad starts. The ads look like part of a signature. 11) Much of the typography is so small (looks like H1 size) that it is almost impossible to read. To make matters worse, the MINISCULE text is LIGHT GRAY on a WHITE background. What does not make any sense to me is that you WASTED THOUSANDS of HOURS writing a website, then you throw it away and try to RE-INVENT the wheel again. What is the point in writing something only to throw it away? Better to write something and then IMPROVE it, not start over from scratch. Or to put it another way, IF IT AIN'T BROKEN, DON'T FIX IT!!! And if it is broken, FIX ONLY WHAT NEEDS FIXING. Don't throw the baby out with the bath water just because the water is dirty. I am sure that if I were to stick around much, I would find many, many other nonsensical bugs and/or irritations. I should take some screen shots and post them, but I just don't have the inclination to do that since I know I would be wasting my time. At any rate, I probably won't be here much. No point in ruining my eyes trying to see where everything is and trying to read the content by scrolling left and right for EVERY single line. And no point in spending much time on a website that will FREEZE my computer because it is a CPU HOG.
The bulk of your problems would probably go away if you used a modern browser. Firefox 3.0 is about about half a decade old (about 150 years in Internet years). As far as browser version cut-offs, Firefox 4 is the oldest version of Firefox we will reasonably try to support. Firefox 3 is just too old these days.
All the above issues will be your browser, they are mainly the cause for naff alignment and will also be the cause for you CPU overload. Forum wise i think its a fixed width and ide guess at about 760/780px? so its not very wide at all so again will be your browser
It does sound like your Browser/Pc is at fault, If you have that many problems with the site try a clean install of windows (windows 8 is good) and a modern browser & install a Anti Virus. If you CPU hits 100% is likely you have malware installed on your Pc that's infected your browser. The forum layout is great with 1920,1080 on a 27" screen.