I've been running Vim with the HOME environment variable set for a couple of weeks now and it's remained consistently fast to start up. As a test I went back to unsetting $HOME and it went back to being very slow to start, so there's definitely some combination of the way I've got vim set up (the lack of any configuration in %USERPROFILE%, the directory structure with c:\vim\vimfiles, c:\vim\runtime and c:\vim\gvim.exe) and the lack of a HOME environment variable that makes gvim decide to go extremely slowly. I really like having the file structure as it is as I can have a copy of c:\vim (automatically synchronised) on a work network drive and if I have to use someone else's PC temporarily, it runs off the network drive with all of my configuration (albeit a bit slower due to the lack of $HOME and the fact it's loading everything over the network).
Having HOME set is a bit of a pain to be honest. I tried just setting it to /home/al (as expected by cygwin, and set by cygwin if it's not set in the global environment), but that made TortoiseHg have a flap due to there being a cygwin symbolic link .hgrc in cygwin's /home/al, which TortoiseHg didn't understand. If I set it to anything other than /home/al, cygwin decided that the $HOME location was my new home directory and ignored all my configuration.
I ended up with HOME set somewhere suitably random and with a whole load of edited cygwin startup stuff that made sure HOME was set to /home/al in cygwin regardless of what Windows had set in the global environment.
It would have been much easier if Vim started properly without $HOME set, but I guess that's not going to be an easy thing to fix. At least it works now.
Al
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