Ron McElfresh, a Mac360 colleague, tried out the new Flash player on a Mac:
Checking the Flash Features page you’ll see a number enhancements for desktop computers, some for mobile devices (optimization for mobile video and a new sleep mode), and even a browser privacy mode (goodbye Flash cookies?).
And, after a few days of using the new Flash in Safari?
I can’t take it anymore. After two days of heavy usage, both Safari and Firefox began to slow down, and the Flash plugin began to suck up ever more CPU cycles—even on a fast iMac with 4 gigs of RAM. Flash player might be OK for streaming a video or movie, but it can’t handle Flash ads in multiple open browser windows.
That’s been my experience. Flash player streams movies just fine, but can’t handle multiple web pages and multiple tabs loaded with Flash ads.