Hi.
Your PC's spec's is more than good enough to run Inkscape at an acceptable speed.
(At our age - why hurry!?)
You just have to "tweak" Inkscape a little.
On Inkscape 0.91pre3 r13670 - I set my preferences; (Shift - Ctrl - P)
Rendering:
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Set the "Gaussian Blur" and "Filter Effects" according to your "image complexity"
- it's always a tradeoff between quality and speed.
You can also speed up the rendering by "turning off" the filters by selecting;
- View - Display mode - No filters
Hope this helps.
To get the lines "correct" for your book page;
Draw a curve of the top and then one for the bottom of the page (following the page top and bottom outline),
select the two and use the extension - generate from path - interpolate.
Example here; (As an engineer I have to have my square pad

)

BTW: Your PC will run blender without problems,
if you have a GPU on your screen card you can speed up the rendering process a lot,
google "blender gpu rendering" fo instructions on how to set up.
The blender interface uses a different renderer for screen updates
than Inkscape and performance is never an issue (until the "final render"
where you generate the image itself).
Happy Inking!
RGDS
Ragnar