I have to build and test a project with this dependencies

...
"dependencies": {
      "gtk-d:gtkd": "~master",
      "dunit": ">=1.0.9",
      "dejector": "~master"
}

These are the results on my (old and slow) PC:

|           | 1st | 2nd   | test |
| --------- |-----| ----- | ---- |
|dub        | 38s | 14s   | 45s  |
|dub --rdmd |  8s |  6s   | -    |
|make       |  3s |  0s   | 9s   |

1st indicates first build time (ie 'time dub build'), 2nd indicates second build without changing anything, and finally test indicates test time (ie 'time dub test')

As you can see test takes 45s ... so I'm therefore obliged to use make.

Is there a way to improve dub performance?