Improve compilation time

[josecelano]

Hi @da2ce7 @WarmBeer ,

It's starting to be annoying the time rust takes to compile.

On my laptop:

time cargo test
real	3m6,082s
user	16m43,377s
sys	0m36,504s

time cargo nextest run
real	2m40,253s
user	17m36,878s
sys	0m39,168s

And I usually run tests frequently. What I'm doing is working on the next small change while I run tests.

I've found this interesting article with many suggestions:

Tips for Faster Rust Compile Times

If you run the cargo build --timings --all-targets command you'll see something like this:

Compilation for integration tests is very slow. The article suggests using only one file. I do not even like the big files we have now, but maybe we could have one binary but multiple mods.

Anyway, I think we should spend some time improving it otherwise the development experience will not be enjoyable anymore. Besides, pipelines could also benefit from this improvement.

[josecelano]

I think what @WarmBeer is doing here will help to make it faster. I think we could extract more independent packages, for example, the API, UDP, and HTTP clients used for testing the servers. They already are independent pieces of code, and we want intentionally to keep them decoupled from implementation details.

[josecelano]

I did a test with one single test binary here, and this is the result:

It's even slower! 🤔