Too late for me. Atom replaces sublime in my workflow.
(I'm kidding, I understand the slowness is due to the webkit rendering...)
Think about it. It's 2015. My PC has 8 cores running at unimaginable speeds. It has 16 GB of memory. And my text editor couldn't open files over 2097152 bytes.
Am I living on a different planet from everyone else? How can people accept this as a normal situation?
Sublime Text, whilst not perfect is far better than anything else out there. It doesn't struggle with these files either.
Except on Windows it does struggle, a lot, and others like Notepad++ open large files way faster.
Just checked it again: a 20MB matlab m-file opens instantly in NPP however it takes ST3 about half a minute. Half a minute, seriously? After renaming it to txt to get rid of syntax parsing it takes like a second. Which is still longer than NPP and starts to get seriously annoying with files of hundreds of MB.
Still, it's my go-to editor.
More and more I tend to use software that is either minimalistic or started in another era (Emacs + command line tools). The one exception is the web browser which has to be modern or a bunch of websites won't work.
I don't notice any half second delays though. I used to be an Eclipse user and recall it being much more sluggish.