No problem.
Most RAM available nowadays are available in 64MB increments thus 128MB+64 = 192MB. I'm sorry if I quoted 198MB (I wasn't thinking correctly).
However this is related to the type of operating system that you use. Although WinNT recommends 64MB or even 128MB for decent performance, expect to see delays especially if your running services such as SQL server or other administrative jobs. So it is recommended that you move out of the "minimum" requirements. Most of our servers here that run WinNT have no less than 256MB and they still have performance problems if they are hit constantly.
Now in your case, since you are loading the image on your machine (i.e. 127.0.0.1/image.jpg) it is probable that its just too huge to be displayed quickly. (depends too on how the image was compressed--Make sure its Baseline compression not Progressive JPEGs) Also older versions of IE 5.0 or lower and Netscape 6.0 have problems decompressing images. Because remember JPEGs and GIFs are a type of bitmapped images not vector images, each line still has to be processed and executed. For an image of that dimension you still have to account the translation to convert each pixel into a picture into the browser.
Finally, the browser was never meant to display huge and complex images. If that were so then we would have gotten rid of photo viewers long ago. They are simply too complex to handle other sorts of information to make them super fast at decoding large images.
Hope that helps.
