[xmonad] Profiling XMonad

Hello, I'm trying to allow RGB images as buttons in XMonad. It's alreasy working, but now XMonad leaks a lot of memory (each time you change focus about 1 or 2 megabytes are taken from memory), so when a little time passes, it becomes unusable. I'd like to ask for help profiling or with any other thing that may help me solve this problem. As of now, I'm saving the images as String. Then, using Foreign.C.String.newCAString, I convert it to a CString, which is what Xlib expects. After that, I create a Image using XCreateImage, which I paint using XPutImage. Finally, I call XDestroyImage to free the memory. So, as far as I know, no leak should be possible :( Thanks in advance.