xXNeoREXx

Well thanks for the support, it seems like im stuck on the program with game maker...
Does anyone knows of a good easy to use macro program anyway?

can someone help? (sorry for spaming just want to get this solved)

I have gm 8.0 but in global game settings there is a check box, freeze game when the form loses focus?

The button is already checked off

Ok, Not sure on how this works, but if you make the file inside your game fully white (or with absolutely nothing), to make its filesize negligible after you have designed the room layout, then use background_replace(...) on the tileset which was previously there.
(I would only do this in a separate GMK though once your game is ready ~ Just incase you accidently delete something)

Unfortuneately, you can't choose when to load internal resources as the game decompresses all the assets as its loading.

The only other potential solution i can think of (which is super tedious) would be to design your level once, then in-game, loop through every tile on a specified layer and save its position and texture position to a text file. Then when loading a level, load the texture and before the room opens.
(This probably won't be much faster as text file reading is slow, and it would still require you to delete the texture anyway, so the above method would work better.)

You have a nice solution, the transparent replacing solution could be alright.
Its a shame you cant control the resource loading but I think that your first solution is pretty decent.
As for the second one, I think its too tedious... its good in theory but in execution it takes too much effort for a thing that can be avoided.

Thanks for the help!
BTW if anyone else have another solution please reply to this post. thanks.

You can make resources external, however you cannot make tilesets external, Although the number of tiles won't really affect loading time a huge amount as tiles are designed so you can have alot of them.
What i would recommend doing is loading sounds/Specific sprites/Backgrounds as you go along.

You can do this with:

sound = sound_add(...);
sprite = sprite_add(...);
bkg    = background_add(...);

sound_play(sound);
draw_sprite(sprite, 0, x, y);
draw_background(bkg, 0, 0);

I was well aware that you can call external resources and that is a good solution for sprites and backgrounds, but if I want to edit a room and use tilesets, I have to implement the images into Game Maker to see what i'm doing.
Therefor there is no way I can call externally to tileset because they must be built into the room editor first (which requires them to be in the resource tree)
and its well and good that some tile sets are small in size like in 8bit games, but i'm developing using sometimes very big tiles in size and alot of them. you cant build a massive game with a single load time at the beginning.