Hi,
I'm wondering about scalability of zp. I am planning to launch a site on a 512 mb VPS using zp to run a massive photo gallery. The album will have upto 60K images, with almost 2K directories.

Will zp be able to handle such a massive gallery? Almost all the zp galleries I've found on the net are personal galleries with only a handful of photos.

Has anyone actually implemented a large gallery using zen? If so can anyone point me to any such gallery?

How does zp perform under high-load? Is there any busy site running zen?

I have have installed zp on nginx+php-fcgi, with url rewriting disabled. I am going to cache some of the content as per the official FAQ. Are there any other performance improvement code for zp?

Please see here: http://www.zenphoto.org/2007/12/installation-and-upgrading/#6

Server-/clientsite optimization (Note: these are third party solutions):
http://www.zenphoto.org/2008/01/hacks/#clientside
http://www.zenphoto.org/2008/01/hacks/#serverside