As an alternative, there is also Save Page WE which works well for me. It takes some time to save a page but I cannot remember a delay when opening the resulting HTML.
I personally save pages as plain text though so that I can use grep etc. later on. Pages with many essential graphics I also save as PDF or epub.
I personally save pages as plain text though so that I can use grep etc. later on. Pages with many essential graphics I also save as PDF or epub.