Do I need more memory for Parallels/Vista?

Hi, I have a MacBook Pro with a 2.16 GHz Intel Core 2 Duo and 1 GB 667 MHz RAM running 10.4.10.
I installed Parallels 3.0 and Windows Vista. I also need to install Office. I would like to have Leopard installed once I am sure Parallels works with it (the Parallels people tell me I should wait a few weeks).
The problem is that when Parallels is running my Mac is sloooooowwwww as molasses in January. Last week it ran like a breeze but this week it's so slow I have to wait 2 minutes for my mouse to respond. The difference being that this week, I actually need to run applications.
Will upgrading the RAM take care of the problem, or will it do nothing for me?

I can vouch for this. Vista is a memory pig. Expect it to use over 512MB of RAM while idling. I've also tried running Windows XP in Parallels on an iMac with 1GB of RAM. With few applications running in OS X, and only doing updates in XP, all available memory is eaten up, and the machine acts like a dinosaur. In my opinion, to effectively run Parallels with Windows 2000 or above, _at least_ 1.5GB of system RAM is required. Anything less, and you're either gimping Windows (by assigning too little memory to the virtual machine) or the entire system (by assigning more memory).
On another note, if you're going to run anything remotely intensive (video or photo editing, or game playing) use Boot Camp instead.

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