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Skipping existing files is too slow for two reasons

Hi, I'm trying to download a directory with about a million files using WinSCP 5.19.1. This takes longer than a day. So on the second day, I want to quickly skip existing files and continue downloading the other files.

However, WinSCP apparently is skipping existing files one by one extremely slowly. It skips them more slowly than it downloads them (because downloading can be done for several files in parallel). So on the second day, none of the remaining files are downloaded.

Please let WinSCP get the full file lists from both computers and compare them once with an efficient algorithm (sort both and go through them in parallel), then download the missing files. Don't compare the presence of files one by one.