Loud Fans and Adobe Flash on Early 2008 MacBook

Yufang has an Early 2008 white Macbook, which we upgraded to Snow Leopard last year. Since adding 64bit software to her daily processing, she’s had to deal with a lot of loud fan revving and droning while using Safari and Adobe Flash Player. Tonight, I finally thought of a solution that, so far, seems to have done the trick. Up to this point, I have tried everything short of a nuke-and-pave reinstall of MacOS X, including: installing all Apple updates, continually updating Flash, repairing disk permissions, and resetting the SMC. Tonight, I was watching what was going on in Activity Monitor, and I thought about the fact that Safari runs in 64bit mode by default and Adobe Flash is still 32bit software on MacOS X. I wondered what would happen if I launched Safari in 32bit mode and tried loading up some Flash videos. Eureka! Now, Flash isn’t identified as running in Activity Monitor, and I assume is running within the Safari process (or via some kind of process reporting magic). Whatever the case, it seems that if you are experiencing this same problem on a MacBook (probably due to its lack of a real GPU), you can resolve this problem by running Safari 4 in 32bit mode: Select the Safari icon in the Applications folder > File > Get Info > Check “Open in 32bit Mode” > Close window > Relaunch Safari. Good luck, and please comment if you have other ideas or if this doesn’t fix your problem.