Slow popup-menu

Hi, I have a button which opens a popup menu:

<?xml version="1.0"?> <button backcol="none" display="icon" label_pos="right" textcol="none" type="menu"> <label>HTML</label> <tip>HTML-Programme</tip> <icon1>#DOpusVista:ftpaddressbook</icon1> <button backcol="none" display="both" textcol="none"> <label>New Button</label> <icon1>#newcommand</icon1> <function type="normal"> <instruction>go Z:\Dir1\SubDir FOLDERCONTENT </instruction> </function> </button> </button>
This is very slow to open the popup menu (it takes appr. 5-7 seconds to open!), because the folder has several files and sub-directories in it to read in. Apparently the directory content is read every time when I click the button, which is useless - couldn't the folder content be stored in memory when DOpus starts up? (The folder content doesn't change very often).

Is there a way to avoid the long waiting time when opening the popup-menu?