GTK3 apps are too slow in xubuntu 13.04

[horonitel]

Hello everyone!

I have a Samsung N145-JP02 netbook with Kingston V300 60GB SSD and 2GB of RAM installed. It works really fast with xubuntu.
The problem is that GTK3 applications run VERY slow. For example, there is an application to change XFCE4 menu contents.
It starts for about 10-12 seconds! Same problem with Transmission. As far as I understand, they all use GTK3.

Just compare - Skype (QT4) starts in 2 seconds, Libreoffice (GTK2) in 4 seconds.
Any ideas how to speed it up? Or it is impossible and I should just replace this apps with their gtk2 alternatives?

[dino99]

is that netbook able to run a pae kernel ? or have it to use llvm ?
glance at the System Monitor to see which process(es) is/are using too much resources; and maybe the logs could also help you with usefull warnings/errors

[horonitel]

dino99, thanks for the answer.
Please make yourself clear about PAE, I do not understand why you mentioned it. As far as I know PAE allows to use >4GB ram on 32-bit operating systems. As I said above, this netbook has only 2GB of RAM. Why do I need PAE kernel?

[vasa1]

.... For example, there is an application to change XFCE4 menu contents.
It starts for about 10-12 seconds! Same problem with Transmission. As far as I understand, they all use GTK3.
...

What is the exact name of the first one? What about Evince (Document Viewer)? Does that also take a long time?

[horonitel]

I do not know it's name. I could not find it in ps aux output
Empty evince (no document opened) takes more than libreoffice writer with 1-page docx.

[vasa1]

Can you try changing themes? What theme are you using now?

[dentaku65]

Try to install the gtk engines:

sudo apt-get install gtk3-engines-xfce gtk2-engines-xfce

In my case the applications start instantly

[vasa1]

Try to install the gtk engines:

sudo apt-get install gtk3-engines-xfce gtk2-engines-xfce

In my case the applications start instantly

Xubuntu ships with the necessary engines because the default theme includes gtk2 and gtk3.

[dentaku65]

Xubuntu ships with the necessary engines because the default theme includes gtk2 and gtk3.

Well is surely true, but on my xubuntu quantal (clean install) those engines were not installed; in any case if you execute transmission-gtk without the engines indicated the launching it takes about 15 seconds, with the engines starts instantly

[horonitel]

Well, I removed unico engines and installed xfce4 engines, which were not installed by default. Also I've changed gtk2/3 theme to zukitwo, now gtk3 apps do not display errors if started from terminal. Now It's a bit faster, but still far from being like gtk2.