OK I’ve noticed a few people a searching for information about Zuma Blitz on IE9. I did notice this issue myself when I first tried IE9. The main problem is the hardware acceleration that comes turned on by default in IE9 which results in Zuma, and anything else Flash intensive, being really jerky and laggy unless you are on a pretty powerful computer. This is because both Flash and the web browser are using hardware acceleration and competing for your graphic cards processor. This also applies to Firefox 4. Anyway you can try to improve things by disabling the hardware acceleration in either the browser or in Flash.
To disable it in the browser go to Internet options by either clicking the gear cog on the right hand side of IE9s toolbar or go to your control panel. Once open click on the Advanced tab. The very first option is Use software rendering instead of GPU rendering* so tick that. You will then have to restart IE9. Hopefully Zuma Blitz will be a bit more tolerable now.
To disable it in Flash simply go to a web page that has Flash in it and right click on the flash. From the menu that appears select Settings… and then deselect the Enable hardware acceleration option.
So first try disabling one. If that doesn’t work re-enable the one you disabled and disable the other one. If it’s still jerky try disabling them both.
If all else fails you can always just uninstall IE9 and go back to IE8 or try one of the other browsers such as Firefox, Chrome or Opera.