I have created a Add-on (BHO) in IE and now running into performance issue. I am not able to check how much memory my Add-on is consuming.
Actually it is not sure that Add-on is culprit or something else is there in browser
Attach to Internet Explorer process and debug normally with Visual Studio, then you can execute methods from the Watch or the Immediate window using the methods that you can find here:
How to get memory available or used in C#