<p dir="auto">Opening files compressed with UglifyJS or YUI compressor, which put everything on 1 line, can take seconds, even for small files (&lt;100kb). Pasting a line like that into an already open file can also freeze things up. I guess syntax highlighting might have a problem dealing with the long lines.</p>
<p dir="auto">If it's the syntax highlighting, perhaps that can kick in later so the file can at least be displayed within a reasonable time? Maybe it's a more fundamental problem. It just doesn't feel right to wait around 4 seconds for a 100kb file to load.</p>
<p dir="auto">May be a known issue, but files with large embedded images such as github's public/enterprise/maintenance.html will often cause Atom to freeze (MacVim actually struggles as well).</p>
<p dir="auto">Seems some of them (github's public/maintenance.html for instance) work fine when in soft wrap mode, or until you move your cursor to the long line when out of soft wrap.</p>