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Road network analysis for big data

You can execute Service Area from point in a loop for each point using pyqgis. Try this on a small sample of your data first. You can select a sample of points and change pointlayer.getFeatures() to ...
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Splitting line-layer with point-layer in QGIS

I have a solution for you but its not exactly straighforward Dissolve all lines if they aren't all dissolved Convert dissolved lines to single parts Create all line intersections Extract points ...
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