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The opinions expressed herein are my own personal opinions and do not represent my employer's view in any way.

Actually, as I'm self-employed, I guess that means that any views I expressed here aren't my own. That's confusing!


Theme modified from one by Tom Watts
C#/F# code styling by Manoli (for posts pre-2016) and Google code prettify (for post from Jan 2016 and beyond)

My rambling thoughts on exploring the .NET framework and related technologies

Every now and then, I have seen my CPU usage jump up to close to 100% on all cores, which can slow things down somewhat...

This looks really impressive, like I'm working so hard that my machine can't keep up with my frantic pace. Sadly, this isn't always the truth!

Looking at Task Manager, shows the culprit to be microsoft.alm.shared.remoting.remotecontainer.dll.

If you are using VS2013 or later, you may notice some annotations above your methods and properties...

This feature is known as Code Lens, and is one of those things that is really worth getting to know, as it's a massive time-saver.

Quick digression from the main theme of today's symposium to tell you why it's so good...

By default, there are about five or six code lenses, but as I've changed my options to show only one, only that one is visible in the picture above. This one allows you to see all references to the item in question. Click on the link and you'll see something like this...

This can be docked as a window (click the little rectangular icon in the top-right corner of the code lens pop up). If you double-click an item in the list, you are taken to the appropriate line. Jolly useful.

End of digression, back to the point

However, this fab feature comes with a price. The assembly responsible for scanning your code and updating the Code Lens is the one mentioned above, and can use whopping amounts of CPU.

However, as the most (and in my opinion only) useful part of Code Lens is the references, you can tell VS not to bother with the rest, which will avoid the CPU usage. If you write unit tests (I know, we all should, but let's be honest, most of us don’t!), then the unit test one is also very useful, as it shows you how many tests hit that method and how many passed. However, unless you're really doing TDD properly, it won't be that much use.

Go to Tools -> Options -> Text Editor -> All Languages -> Code Lens and uncheck all of the individual checkboxes. Leave the "Enable CodeLens" checkbox checked, as this will give you the references link...

This should make a big difference to the CPU usage.

Possibly useful extra tip

The other thing that sometimes helps is to have a look in C:\Users\<username>\AppData\Local\Temp\ALM\ShadowCopies\<some_guid> and see how many folders there are. The more there are, the slower Code Lens will be.

You can safely delete them all, and it will slowly replace them for you. I had 5,400 of them, but have seen reports of 190,000! You'll need to do this every now and then if you find that microsoft.alm.shared.remoting.remotecontainer.dll continues to use CPU.

However, I found that they were replaced almost as quickly as I deleted them, so your mileage may vary.

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