There's other threads too, they know about it but nothing has been done and it seems to be a case of "OSX-issues"... seems to be a lost cause.
0.10.5 works for even moderate sized games. However, over 1000 images and it often encounter the same red loading bar.
The thing is OSX has the new Safari that is much faster than Chromium. There should be a Safari based wrapper, similar to the mobile approach. Very small filesize overhead, much more compatibility.