Minecraft crash "heapdump" just finished permitting more RAM for minecraft and enabling java virtual machine to work

Crash

What should happen: Minecraft starts up normally, perfectly.

What actually happened: Minecraft took long to start up and wouldn't go pass the "mojang" startup screen. it crashes and in the minecraft launcher, it says "uhoh it looks like the game has crashed! sorry for your inconvenience." I still cant play it.

Steps to Reproduce:
no idea.