Comment 3 for bug 486920

Depending on the complexity of the used pattern the result of the extension is one single path with a huge number of nodes, a file structure that often reaches the limits of Inkscapes rendering performance. OTOH it could be related to an issue as described in bug #193671 “Incorrect rendering and 16 exabyte memory usage”, most likely due to limitations of the extension system implementation and possibly Python itself?

Have you tried to use the LivePathEffect 'Pattern Along Path' instead?