Time required to build and/or run a project is seemingly excessive

I’m submitting a performance request

• Library Version: 0.17.0

Please tell us about your environment:

• Operating System: OSX 10.11

• Node Version: 6.4.0

• NPM Version: 3.10.6

• Browser: Chrome 52.0.2743.116

• Language: TypeScript

Current behavior: When executing au run, or au build it takes considerably longer to build my project than it did with gulp. The longest part of the build process is when it traces my src directory. Is there a configuration param that will speed things up a bit?

Expected/desired behavior:

• What is the expected behavior? For au run to start up faster than it currently does. Preferably as fast as gulp did.
• What is the motivation / use case for changing the behavior? Speeding up workflow. The bigger my project gets, the longer it takes. As of right now I have 15 small files in my src directory and it takes 30+ seconds before I can run my app.

[3cp]

I waited too long for this to be fixed, so I spent some hours today and got a working fix!

Try this in your big project package.json to see if this solves your problem.

"devDependencies": {
    "aurelia-cli": "git://github.com/huochunpeng/cli.git#trace_cache",
    // ...
}

Surprisingly, the slowest part is not repeated parsing (to find out deps), it’s writeTransform. I did a profile, writeTransform consumes 85s of 110s (my project build time).

My fix includes:

1. uses amodro-trace’s issue5-trace-cache branch (it caches deps), patch cli to use it, it reduces my build time from 125s to 110s on a project with 144 js files.
2. patch amodro to use cached contents, it reduces build time to 32s.

@EisenbergEffect could someone from Aurelia try this before I submit a PR? https://github.com/huochunpeng/cli/tree/trace_cache

UPDATE: I confirm the patch works in au run --watch watch mode.

[EisenbergEffect]

Fixed.