definately your computer. too much porn! try deleting some. it may make things run alot faster
I'm just confused because I've heard people complain of poor performance in flash CS4 compared to previous versions. Is there anything wrong with sticking with an older version for the time being?
Are you running Vista or Windows 7?
Then try running Flash CS4 in "XP Mode", you can set it in the compatibility-tab for the program properties.
It seems that some Vista configurations are not really compatible to Flash CS4 and higher. Running it in XP-Mode may take much longer to start-up the program, but then it will run as fast as CS3.