[by bfelaco]

That was pure speculation on my part. But my expectation in general is that on most browsers, most of the time this:
div.appendChild(document.createTextNode(myText));
will be faster than:
...

[by bfelaco]

I am 100% of the opinion that the grid control should not by default insert data from the model as HTML content in the grid, unless a developer explicitly configures Ext to interpret the content as...