Me too. Very large winforms solution with multiple projects. Takes approximately twice as long to compile (from 3 minutes up to 6 minutes for a full re-build). Had to go back to 2015 as couldn't live with the pain.

Me too, I noticed vs2017 build very slow as compared to vs2015, especially on large solution (many projects).
What helped me is to follow the optimization recommendations by people (setting Source Code to None, set Windows to "best performance", ...) AND this one, my own:
* Set the Host computer's setting to optimize on "Background Services" using Windows' properties, Advanced System Settings, Advanced, Advanced tab.

It seems VS2017 as it has a more responsive UI, that the background workers are given less chance to do their work. Prioritizing on background services seemed to have help.

No solution here either. I had to crash it out yet again with switch around in the program at all causes inexplicable pauses and hold-ups. Any designer screen, XSD designers, dbml, anything actually.

It's a large winforms project for sure but on an I7 with 32gb and twin raid SSD's, I'd expect a bit more fluidity to my work. This is 15.4 now.

I have this problem too. VS2017 is 5.7 times slower than VS2015 in a solution with 36 projects. VS2017 is unusable in its present form.

I have this problem too. One build with 36 projects took 5.7 times longer in VS2017 Community vs VS2017 Pro. There's no way VS2017 is usable in its present form.

This worked for me

https://developercommunity.visualstudio.com/content/problem/83893/slow-compile-times-compared-with-vs-2013.html?childToView=111849#comment-111849

This worked for me

https://developercommunity.visualstudio.com/content/problem/83893/slow-compile-times-compared-with-vs-2013.html?childToView=111849#comment-111849

This does not resolve the slow build but helps me do something else while building.

Each time I open VS2017 and build I go in task manager and set VBCSCompiler.exe priority "Below normal".

After that VS is more responsive while building.

PS : I have a solution with more than 100 projects that mix MVC, WPF, WinForms, ASP.Net core, .Net 4.7.1 and .Net Core 2.0

Just updated to 15.5.

Still slow as before... especially on a large class library project with around 2000 files that result in a 25mb dll.

It takes about 1.5 minute to build.

This issue has been fixed and is now available in our latest update. You can download the update via the in-product notification or from here: https://www.visualstudio.com/vs/ Thanks to everyone who provided feedback, votes and solutions for this problem.

I did a lot of tests, even ran custom builds of MSBuild, and suddenly the official MSBuild 15 was blazing fast. It looks like the delayed ngen from installing VS 2017 just wasn't finished. Why it took so many days I can't explain. If you can, perhaps try forcing ngen to finish and see if that helps:

ngen executeQueuedItems