SDRAM or Video Ram?

Work with Adobe Photoshop 6.0 – My system Intel P1V, 256 MB SDRAM 133MHz; Video Card is 64MB GeFORCE2-MXAGP. When processing colour pictures my system slows to a crawl (black & white OK). Do I invest in another stick of Ram or can the video card beupgraded? What is the best to get faster processing? Note: Defraged; removed temp; cleaned caches; disabled items on taskbar, etc.
Would really appreciate your input…Thanks 🙂