Photoshop laggy, poor performance with GPU enabled

I'm using Photoshop CS6 for some time now. I had enabled GPU usage earlier and I remember that Photoshop ran absolutely smoothly without and lag what-so-ever. This morning, all of a sudden, it has become extermely laggy. I don't understand the reason behind this. This had happened to me before as well but it became alright after a few days. This also happened to me once while using Photoshop CS5. I didn't install any plugin and didn't change any software. I also want to point out that I had 13.4 driver version when Photoshop was working fine, and now too I have the same driver version.
CPU: AMD Phenom II X4 955
Memory: 6 GB
Free storage: 8 GB
GPU: ATI Radeon HD 5850

I've also noticed poor performance since installing the 10.1 plugin.  Not just in HD video etc, but in general use.  So much for "improved performance"...
No idea on solutions at this stage - In the process of downgrading to previous version to see if that fixes my problems

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    I am an independent blog contributor, not an Altaro employee. I am solely responsible for the content of my posts.
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