Is there a limit to a multiplayer map's size (height, width)?

I've always thought 256 by 256 was generally the biggest used for custom maps online, but if you made one larger, such as 352 by 192 or some odd number, would it cause any problems online?

I can't get it bigger than 256x256.

It won't play if it's bigger than 256x256, or is it that you just can't make a map with those dimensions? I'm using WE Unlimited, so I can go beyond 256 in the editor.

Using Zepair's (sp) you can make maps up to 400x400.

Using Regular World editor i believe i can only create a NEW map with 256x256. but if i adjust its boundries im allowed to go b eyond that.

Nope, I tried that. You can't

According to WE unlimited, you can go 480 to 480.

Seems like an odd number. 32 less than 512.

You could go to 480x480, but I like to see you try to load that. My first map was 192x192 and took 2 minutes to load on battle.net (and it wasn't the fault of units or scenery as there was almost none pre-placed), after reducing the size to 168x168 it started loading in less than 20 seconds. The loading time increases unproportinally with map size. 480x480 would probably take an hour to load, if the game wouldn't freeze up completely.

I believe that's an exaggeration, or caused by the WE improperly saving the map.

168 x 168 is theoretically 28,224 'terrain' points. 192 x 192 is negligably higher when you consider the processing power of today's, and yes, multiple year old PCs.