Hi,

According to the specifications you can upgrade the RAM to 2GB which may help improve performance for you.

(click on the toshiba_miniNB505-N500BL.pdf link towards the middle of the page in the link)

This is taken from the specifications.

Memory Upgrade ( Important Note)

Part Number Description

In order to upgrade, you will need to determine the current memory speed.

Upgrade using like memory speeds ONLY.

1) Locate gray part number label on bottom of machine

2) If there is a “D3” in the upper right hand corner of the label, then DDR3 memory is installed, upgrade using the following-

 PA3856U-1M2G Toshiba DDR3-1066MHz, 2GB Memory

3) All other units, assembled with DDR2 memory, upgrade using the following module-

 PA3669U-1M2G, Toshiba DDR2-800MHz, 2GB memory Module

Alternate Identification Method(Serial Number)

 PLL50U-01S008(4B131114K or greater, or a serial number starting with 5B , 6B ,7B , 8B) use DDR3

 PLL50U-01S008(4B131113K or less, or a serial number starting with 3B , 2B ,1B, ZA, YA, or XA)- use DDR2

Here is a link to the ifixit Toshiba Mini NB505 RAM Replacement guide which may be of some help.