Quicklook is not quick anymore. It needs to convert even .mov files! Is there a solution?

Today, I got a rather agressive reminder to upgrade to Mavericks on my workstation. I work as a motion graphics designer and as a result of that, I am opening, watching and making movies all day.

On my home computer, an iMac, I installed Mavericks, and then Quicklook became totally unusable for movies. Even .movs in Apple Animation codec cannot be 'looked quick at', but need to convert.

Untill this is solved, I am not going to upgrade my workstation to Mavericks, since it is gonna cost me a lot of time and annoyance.

Why is this brilliant feature of Mac OSX crippled in Mavericks?