macromedia flash sitedesign: Why the hell the flash sites or games run slower on Macs?

I have a Mac an design flash sites... i test them and run them an design them
to run in certain speed then i show them to people who have PCs an they run
faster...

You can test with this game www.diehard4movie.com/drivehard/

Is there a solution for this problem?

www.diehard4movie.com/drivehard/drive.html

Unfortunately no. You can search the forums, many people have posted this same
problem before (me being one of them).

For some reason Macs have a crappy flash player, regardless of whether it was
designed on a mac. There are myths about ways to get around it like magical
frame rates (21,31,61) but I havent found that this works.

One thing I found that helped was to be sure and not use an opaque or
transparent window mode when exporting/publishing your swf. This causes major
lag on macs. But if you leave it in the default or no window mode, it should
run better.

Hope this was helpful.

GAMBRKER