Hi,
I just ported the libnoise library and want to use it with kha to make a tool for procedural texture generation.
Using just the library, targeting cpp, the values to fill a 512x512 image are generated in ~350 ms while in kha targeting linux it takes ~2 s, that's four time slower than the html5 target.
I assume the difference may be caused by some HXCPP defines used by kha, but I lack knowledge in both cpp and hxcpp to confirm that.
If anyone could point me to any direction to find what could cause such a huge difference, I'd appreciate

Kha doesn't use any hxcpp defines that could slow things down AFAIK. Did you maybe compile in debug mode? If not, can you share the test code so I can run it in a profiler?

Is debug mode active by default ? I don't know how to activate it in kha. My project.kha is very basic :

{
	"format": 3,
	"game": {
		"name": "TexGen",
		"width": 800,
		"height": 750
	},
	"libraries": [
		"libnoise"
	],
	"assets": [],
	"rooms": []
}

and here is the test class :
https://gist.github.com/memilian/f7743ff5913ca11c4bc3#file-texgen-hx

For me it's about one second in html5 and 0.3 seconds in Visual Studio's C++, so I would guess you do indeed run in debug mode. Do you use --compile or do you use Code::Blocks? --compile doesn't add any optimization parameters to the generated makefile.

Ho well, you are right, I started to use --compile because it was faster and more convenient than opening another ide.. I'll have to find another workflow. So if I understand correctly, the only way to not run in debug mode is using the generated project's release configuration... That make a lots of sense now Thanks for your time !

Oh, no need to change your workflow, I'll just add a release mode switch.