I have imported an jpg-file, embedded it, and then performed "Trace Bitmap". There were still nodes there, that I wanted to remove but I can't because my CPU goes crazy. The file is simply too big.

What to do? How can I resize an svg file? Make a png-file of it and load it again, and do the same procedure as described above? Or is there another possibility?

there are some options in the trace bitmap dialog that you would probably need to use to reduce your filesize. for starters, how many colors are you trying to use?

Just one: black.

black and white, I mean.

hi Amadeus. There are two things you can try. You can make the jpeg smaller before tracing BEFORE importing it into Inkscape. You can link, not embed the image. You can hit control L after tracing with the path still selected, this should reduce the number of nodes considerably. Oops, I think that's three things.
What method are you using to trace? Do you have remove background checked or unchecked? stack scans? smooth paths?

I will give it a try. Thank you for answering, druban.

You can also, try changing your Inkscape VIEW MODE to Outline
>View >Display Mode >Outline

This should improve your computers performance for larger inkscape drawings

I would also try clicking on 'Path', then "path Simplify" to reduce the number of nodes to begin with. you can do this multiple times to keep reducing the nodes, just stop before it changes the look. After that, I'd simply make the object physically smaller on your page (hold down the CTRL key while decreasing to retain the shape/size). Once you've traced it, you can always resize to make the object larger again.