Thanks, Mark. Right now even 1.7.37 is the latest dev version and I couldn't see any bold fonts at all.

Also, this is fast now:

var sp = moi.ui.getUIPanel('moi://ui/SidePane.htm');
var st = sp.document.body.style;
if (!st.display || st.display == 'block') {
    st.display = 'none';
} else {
    st.display = 'block';
}
moi.ui.mainWindow.contentChanged();

(Under 1.4.1 this looked like running on a Pentium 2 or so.)