Ulysses. I have just shy of 1,000,000 words in it and it’s blazing fast on all devices. The only hassle is the hoops you need to jump through on iOS to get the URL of a sheet, but I do work on a Mac every now and then and do most of my linking there using an Alfred workflow I built ( https://github.com/derickfay/Alfred-GetUlyssesSheetURL ). This set-up replaced an attempt at a Zettelkasten in NVAlt and Editorial which wound up being too fiddly for me to want to use it. But the big advantage of Ulysses is the organizational flexibility and x-platform linking.
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