Crash when Quicksave, slow loading

[Pater-Lingen]

In the ...steamapps\common\Portal 2\bin.trex folder, there is a file "bridge.conf".
With the default settings in the bridge.conf, the game starts after quite a while. However, quicksaving always makes the game crash. The game freezes first and shows a message complaining about insufficient memory in the "bridge.conf".
So I just changed the default values in the "Global Settings" to:

clientChannelMemSize = 768MB
serverChannelMemSize = 384MB
moduleClientChannelMemSize = 128MB
moduleServerChannelMemSize = 128MB

Now loading times are faster, and quicksave is possible.