An update: The problem seems to be with a single very long line layer (not sure how many points: I have not yet sorted out how to count them). When I zoom out to see the whole line, one of my eight cores reaches 100% and memory is nowhere close to being full, and QGIS grinds to a halt.
I have had nothing like this kind of trouble in the past running QGIS on far less sophisticated hardware, although in all cases under Ubuntu or Wubi-installed Ubuntu rather than Debian, and on machines with NVIDIA cards. Contrary to what I said before, those machines had *less* VRAM than I have now (I have 1GB VRAM), and I doubt if VRAM has anything at all to do with issues of this kind. I am running QGIS 1.7.0. Any advice would be most welcome. O
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