Slow page refresh times during development

We have a reasonably large ASP.NET MVC app that I work on in Visual Studio 2012 on Win 8. I have a strange issue with slow page load times after recompilation. Usually, the actual build time is about 5 seconds, then the browser opens up and it takes 1-2 minutes to load the page.

Some points:

It loads slowly whether I change a view or recompile the project completely
This is not a performance issue, everything else works really well, there is enough RAM etc.
It happens only with IIS Express. When I switch to the default development server, it works fine.
All the other devs in my team use IIS Express, but they do not have this problem.
I tried to re-install IIS and to use v7.5 instead of v8 and recreated all config files. No luck.
I tried to disable all extensions, obviously it didn't affect load times too.
There is nothing abnormal in Task Manager
It's a virtual machine on my Macbook Pro, but again – this is not a performance problem.

What else can I try?

Solution

Solved by turning off Windows Defender Service. Everything is a hundred times faster now.

UPDATE: I failed to find a reason why Windows Defender is using lots of CPU power pretty much all the time. I tried to google it and it turns out that many people have a similar problem on Win 8 with no good solution.

If you really want to leave Defender on, you can add the project folder path as an exception, but it still will be slow-ish.

Hope it helps someone.

UPDATE 2: The above still holds true in Windows 10. Especially if you're running it in a virtual machine (I run it in Parallels on Mac). The overall speed increase, not only page refresh times, is very noticeable.

UPDATE 3: Apparently Windows Defender has a habit of silently turning itself back on again. So, be wary of that.