MMS slow to open pics folder

Whenever I want to send a picture via text message (MMS), my Q10 is either very slow to open the pics folder OR it seems to time-out, then I have to press the paper clip a second time and it's still slow. I have a little over 700 pics in that folder. Is that the problem? Or, is there something else going on?

Can be the previewing, and I guess you have these pictures on a SD Card. If it's the case, previewing is limited by the reading speed of your card (class 2 to 10 and ultra speed U1 and U2).