[Owncloud] Apache and Nginx

[Saint Germain]

Hello,

I got a server which will only host owncloud and would like to know if
someone can give me some performance tips.

Is there any reason to move from Apache to Nginx ?
Should I use mtm-prefork, mtm-worker, mtm-itk... ?

For the moment, I just noticed that thumbnails generation when viewing
a gallery for the first time is very very slow. But I don't think that
it can be improved without delving into the owncloud code.

Thanks,