Sadly, in the announcement comments, John says this:
"How well large files are supported is mostly a function of the syntax definition being used. Sublime Text 3 does have performance improvements compared to Sublime Text 2 here, but not significantly so."
It would be a couple of lines to check if the file is above some limit and offer an option to open it without the syntax definition applied.
If I work with many small SQL/XML/whatever files, then I want it to look pretty; but if I open a 100+ mb datadump, then Sublime should be able to open it as plain text without waiting for half an hour.
There are valid text files floating around with sizes above 1gb - why shouldn't I be able to open it, run searches and browse the contents? The computing power can do it, you can map it to memory if needed, I can spare 10gb ram if working on that size of data; but it needs to work reasonably fast.
I was unclear in the description - my datadump gb's tend to be sql or xml.
Turning syntax off helps; simply it's a real pain to switch it on/off manually every time, as I'm working both with small and large files of the same type. I'd like the software to do that automagically based on file size or loading time estimates.
Yes, I am very disappointed. I cannot comprehend how the handling of large files hasn't been addressed yet. I really hope at least there is a setting for toggling the syntax on/off based on file size, if nothing else. I mean seriously, DOS' EDIT.EXE is better than Sublime Text in this regard. It almost makes me want to punch a wall or something, all because of a text editor.
"How well large files are supported is mostly a function of the syntax definition being used. Sublime Text 3 does have performance improvements compared to Sublime Text 2 here, but not significantly so."
Big disappointment for a lot of us.