That's exactly why I am switching away from Knockout. I loved every minute of it, but there are features I simply can't deliver on because the perf is too low.

That's exactly why I am switching away from Knockout. I loved every minute of it, but there are features I simply can't deliver on because the perf is too low. There are all sorts of hacks I could do to get around it but that is really going to slow me down. TBH It's not really the rendering that is slow in my experience. It's the fact that every binding attaches an event handler to the DOM. This can take up to 10s for a reasonably sized grid in IE.