Check your custom skin size!

[VO101_Tom]

Originally Posted by cheesehawk

I think the program adjusts the pixel size, but I do have skins that are 1.5mb, where the default ones were about 450kb. The more details and layers obviously, the bigger the file.

My skin was 1.5 MB too, now is 150k. If you are using photoshop, save the jpg with this: File menu \ Save for web & devices" submenu. Here you can easily adjust the compress rate (even 50% is good), you can see the results real time, and you can see the size of the jpg in the bottom left corner.