How much swap do you have, and how fast is your hard drive? Also, is the nVidia GeForce 9500 GT an external video card with its own RAM, or an internal graphics system.
Are you running from the Internet? If so, you must also investigate your Internet connection speed to the site, buffering in the computer, etc.
LMDE Mate 64-bit, LM17 Mate 64-bit
Debian Mate 64-bit, Xubuntu 14.10 64-bit, Ubuntu-Mate 14.04 64-bit, Antergos Xfce 64-bit, PCLinuxOS Mate 64-bit