Very large canvases

i’m traditional painter making move digital via photoshop cs5/64-bit. problem seem having @ large file sizes (24”x36” @ 300 dpi) there’s considerable lag brush. particularly when using new wet brushes. i’m running windows 7 (64bit) on intel quad-core @ 2.4 ghz, 4g of ram. video card nvidia geforce 8800 gts w/512.

 

having said that, what’s efficient route me speed brushes up? point, price isn’t issue, don’t want buy hardware i’m getting diminishing returns. guess i’m looking sweet spot between cost , efficiency. i’d work on canvases in area of 6’x4’ @ 300 dpi, impossible (or @ least painful) on current system. i’m wondering if reasonably possible current technology.

 

thanks in advance.

is matter of slow brush? or speaking photoshop slower?

 

4gb of ram not hungry application photoshop.... had 3gb , have upgraded 6gb , can see massive improvement in performance - i'm on 64bit win & well.

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