[3.5.1 Stable Mono] Extreme memory usage when using C# Dictionary for Web Export

[Xascoria]

Godot version

3.5.1.stable.mono

System information

Windows 10

Issue description

When exporting to web, C# Dictionary (Not to be confused with Godot's, this is the implementation from System.Collections.Generic) seems to take an extreme amount of memory, even when the content of the dictionary is minimal. It's unclear if this is just a performance issue or if its caused by memory leak.

The code snippet shown in the example takes ~3 seconds to run on my native OS, while on Web Export it crashed with an OutOfMemoryException exception.

Steps to reproduce

See minimal reproduction project

Minimal reproduction project

Open a blank project, create a scene and run this code snippet in _Ready()

var random = new Random();
var random_color = new Color[64];

for (int i = 0; i < 64; i += 1){
	random_color[i] = new Color(i/64.0f, i/64.0f, i/64.0f);
}

for (int k = 0; k < 15; k += 1){
	var ColorRequiredMap = new Dictionary<Color, int>();

	for (int i = 0; i < 500000; i += 1){
		var new_color = random_color[random.Next(64)];
		if (!ColorRequiredMap.ContainsKey(new_color)){
			ColorRequiredMap[new_color] = 1;
		} else {
			ColorRequiredMap[new_color] += 1; 
		}
	}
}

Export to HTML Project and run.