Garry's mod takes too long to launch.

The last time the window “Preparing to launch Garry’s Mod” were 6 and a half minutes. Before this one it took 3 minutes. What the fuck? and the next launch will take, 12 mins? It’s annoying me too much. Why this happens???

I don’t know. You probably just have a slow processor. Go get a new better one that works with your computer. Mine takes long to load also lol.

What addons do you have?

I have this too. Ever since update 75.
Oh btw…
AMD althon™ 64 X2 dual core processor 5000+ 2.593Ghz
2GB DDR2
Geforce 9800GT

You probably filled your addons folder.

First, it have to load the game files, PLUS all your addons.
You might want to take a look at this http://wiki.garrysmod.com/?title=Cleaning_GMod