I need to downgrade my OSX, and I am wondering what is the latest version that will run smoothly on my machine Will Mavericks run smoothly or should I go with Mountain Lion, or even Lion I remember my computer operating fine with Mavericks, before I installed Yosemite.

Here are my specs: 2009 Macbook Pro 2.26 Ghz Intel Core 2 Duo 2Gb 1067 MHz DDR3 Thanks.

My question was what operating system is optimal for my 2009 MBP with the hardware I currently have.

Each successive OSX has been more bloated than the one before requiring more RAM to run efficiently.

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In my opinion, go back to Snow Leopard or upgrade your MBP so that it can run Yosemite properly, hence my prior suggestion.

If the bank account permits, an SSD would also be a step in the right direction.

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You also may have third party software that is slowing your MBP such as an AV application or some so called performance or cleaning application.

Installed in a proper environment, Yosemite should be able to run very satisfactorily.

If you cannot upgrade the RAM or dont choose to, 10.6 is the right OS.

Even lion (10.7) wont run well with 2GB.

For Yosemite to run acceptable on your Mac youll need 8GB or 4gb and an SSD.

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