You can't influence that. All you can do: buy a faster CPU if you find your current one too slow.
Incidentally, the CPU-usage of Flash is why Apple doesn't want it on the iPhone. They might be right.
I installed the previous version of adobe flash (V10). don't matter if I use chrome or IE8. shockwave will making CPU run @ 100 % most of the time when I browse a website needed flash
I have a old CPU celeron 900. How do I minimize the CPU usage from shockwave?