A new version of MonoGame.Extended has been published on NuGet. The key features of this release are:
From now on we’ll be doing frequent small releases. Usually with only one or two features in each release. Hopefully this will be better for everyone. 
To install the NuGet package using the package manager console:
Install-Package MonoGame.Extended
Then update your Content.mgcb file as described in the install guide.
Looked a bit at the particle system. Seems to be implemented very cleanly, i should probably adopt the style 
I am also curious about the implementation of your fastrandom, I will try out performance benefits vs Random().Next, but I feel like they are huge.
@kosmonautgames Yeah, the particle code is very nice.
I can’t really take the credit for it though. We got permission off Matt to include his brilliant Mercury Particle Engine into the library. We refactored it a little bit to fit MonoGame and wrote a renderer. Other than that, it’s pretty much identical.
Turns out fastrand is 100x faster than the normal Random, given I initialize both beforehand and change the seed after every call.
Not only that, but when i tested both a million times against each other I calculated the average delta from 0.5 (which should be the expected value) and fastrand’s delta was 2 magnitudes smaller. Wow. Am using that.
Note that there’s an open pull request in MonoGame for a better Random implementation here. It hasn’t been updated in a while though.