I just installed geany-1.24.1 on my Slackware 14.1 x86_64 system. I had set my /etc/gtk-2.0/gtkrc file to point to the oxygen-gtk theme. Geany seemed to be using a lot of memory and cpu time, causing my cpu fan to start whirring. Geany was also very slow in the preferences configuration dialog. This had never happened with geany before. I reset the etc/gtk-2.0/gtkrc to point to Clearlooks-Classic and geany quieted down and the preferenced dialog seemed to be normal again. Maybe there is something in the interface handling of themes that needs some attention.
Thanks, Kevin