slow access to directories and files on a NAS

Hi all,

another noob's question from me... sorry for that!

I have a NAS with linux on EXT3.

Both windows and Mac (a mac book air) access this NAS but... windows, in which it appears as a network mapped drive, works ok, I can see folders and files with a small delay.

From the macbook, as soon as I try to see (open) music directory or photo directory, it will take several minutes to list the directory content.

If I try to open iPhoto and "import files", I can't because it will stop at the photo's parent folder, staying blank for a LOT of TIME!

The other folders, which contains few files compared to those 2 folders, runs much better.

Windows works ok on all folders, which is strange to me.

Thanks for any advice.

Ciao,