Long Unity startup times due to protobuf

[akoolenbourke]

We've been getting very long Unity startup times and I enabled profiling in the editor startup and we saw this.

Sometimes if we delete Library and obj folders we get it starting quickly again but it always comes back at some point.

Any ideas on this and how we can get around it?

[akoolenbourke]

I actually got annoyed enough to take a look and I see it's the post processing function's use of IncludePaths and AllProtoFiles. For every asset imported it goes through every file looking for protos, making parent folders to use as includes etc.
Moving the calls to IncludePaths out of the loop, into a variable seems to make a world of difference.