What are your recommendation for opening large text files on OS X? I found both BBEdit and Textmate to be struggling in this department.
I'm using HexFiend to work with a 60 GB text file and it works great (apparently it can handle files as large as 118 GB).
BBEdit is pretty much the standard for opening large text files on a Mac. I've opened some good-sized files with it, and BBEdit didn't even break a sweat.
How large of a file are you talking about? And how much RAM does your Mac have (both installed and free)?
Edited to add…
It is now possible to open files significantly larger than before; the ceiling isn't unlimited, but it is no longer limited by the previously extant constraints in the OS.
Sounds to me like it's worth upgrading (free for anyone with BBEdit 9.x) and trying again.
1 If you've never read a Bare Bones release notice before, you should. Even if you have no interest in BBEdit. Even if you have no interest in Bare Bones. Even if you have no interest in text editors in general. They're that good. Yes, really. Iä! Iä! Pnoies fhtagn!
Check Sublime Text 2 out. It is one of the best out there.
TextWrangler is a great tool for opening editing and saving large files. I wouldn't recommend if for copying and pasting large amounts of content though. Use it if you don't want to have to deal with the vi interface/commands. Like Loic mentioned, MacVim is a great app if you're more familar with vi.
If you are dealing with files over 2 GBs I recommend 010 Editor. It won't load the entire file in memory which means you can use it to open files larger than your available RAM and opening times will be much shorter (took about 20 seconds to open a 7GB file).
http://code.google.com/p/macvim/ worked with a 1 gig file searching file took about 1 min
For me, where BBEdit choked on 750MB, UltraEdit (not free) worked satisfactorily fast.
My first choice is SlickEdit. It looks a bit old fashioned, but I have seen no other editor that deals with large files (even GBs of text) that fast, and still giving a ton of features.