I recently installed Resharper 6.1 in VS-2010. I'm using it with a rich web application with an Azure-based C# back end and JQuery and other Javascript libraries on the front end.
I love the way Resharper can parse my JS files and provide statement completion, and the code analysis has identified a number of style and syntax issues that I've already fixed.
HOWEVER, I am now experiencing MAJOR typing latency in my IDE as Resharper works its magic. I have a quad core Intel i5 dev box with 6GB of RAM, and the CPU is thrashing and memory usage shoots way up. The latency is so bad that any benefits from improved statement completion in JS files are lost.
I have a number of other JS plugins that I've temporarily disabled, but this didn't help. I then turned off Resharper's Intellisense and reverted back to VS-2010. This helped marginally, but Resharper is still making the editing experience latent.
I've run out of ideas about how to improve its performance. (Maybe, it's not possible to speed things up...) On paper, it's everything I've been looking for. But in practice, it has turned my speedy development machine into a 286 box from the 1980's running Windows 3.1. And as someone who was using 286-based Intel PC's back in the 1980's...that is not a good thing!