Opening / refreshing of large log files is too slow

The only thing stopping me from purchasing Sublime Text and using as my default editor is that it is slow to refresh large files. As a developer, I am often looking at large log files and although I find the quick preview bar on the right nifty for this purpose, it is just too slow to open and refresh changed log files. Until this is resolved, I will be sticking with Notepad++ / Textpad.