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I have created a script to merge 2 or more gds/oasis files with support of few options (rename all cells, rename only cells with naming conflicts, etc.). The script is based on the function copy_tree of klayout API.
It works fine for small gds files. But, it takes a lot of time for bigger GDS/OASIS files. For example, it takes 24minutes for 2 oasis file merging, while it takes 2/3 minutes with a commercial tool.
Is there any alternative to this function ?