I have a 2.0 ghz iMac with 3gb of RAM. How well would Lion run on my machine?

I am debating whether to upgrade to Lion, but I've read stories of it crippling older iMacs.  Would my 2007 iMac (2.0ghz, 3gb RAM) be affected?  I also currently use Photoshop CS3.  Would this still work after the upgrade?

The important thing is that you have an Intel Core Duo CPU. More RAM would be helpful as well. If you are using any PowerPC apps on your iMac they will be rendered  unusable by an upgrade to Lion. You will need to take an intermediate step and get an upgrade to 10.6.8 so that you have the App Store in order to do the Lion download. (Alternately, you could buy the USB Installer but the cost is about twice that of the download.) Do plenty of investigative research before an attempt at an upgrade. It might be a better decision to buy a new machine.
Mac computer with an Intel Core 2 Duo, Core i3, Core i5, Core i7, or Xeon processor
2GB of memory
OS X v10.6.6 or later (v10.6.8 recommended)
7GB of available space
Some features require an Apple ID; terms apply.
http://www.apple.com/macosx/specs.html

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          From: Brucgovn <[email protected]>
    To: Chris Warot <[email protected]>
    Sent: Saturday, May 2, 2015 11:27 AM
    Subject:  I have CS4 Photoshop on my iMac with Mavericks. I am going to upgrade to Yosemite, and don't think it is compatible with CS4. Do I get the full Photoshop CC version for $9.99 a month, or do I need to buy any additional things?
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