Whenever I have multiple tabs loaded in Safari I often notice some behaviour which was not present in Safari 5.

Whenever I pre-load several tabs and then switch from one tab to the other, the webpage is not immediately there, I first see a whitish background for half a second after which the website appears. It's not reloaded, as I don't see any network activity, but it just appears. This behaviour is not isolated to certain websites, it happens at random. De-activating my extensions does not solve the issue. Resetting Safari also doesn't.

The console shows the following Safari messages:

Safari[21818]: CGContextGetDefaultUserSpaceToDeviceSpaceTransform: invalid context 0x0
Safari[21818]: CGContextClipToRect: invalid context 0x0

What can be the cause of this problem and how can I solve this?

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