I was looking for a solution for this. I made a post in the Gaming Section, then a quick Google search showed me this.
http://forums.anandtech.com/message...did=1444203&highlight_key=y&keyword1=autosave
Give it a try.
http://forums.anandtech.com/message...did=1444203&highlight_key=y&keyword1=autosave
havn't been able to 100% verify that this works, but I noticed in my console that it attempted to autosave and failed because of what I had done, and I never noticed a stutter.
Basically you just make all the autosave files read-only.. here's how:
Go to your half life 2 save folder.
Example: C:\Program Files\Valve\Steam\SteamApps\vhold\half-life 2\hl2\SAVE
Hold down ctrl and select:
autosave.tga, autosave.sav, autosave01.tga and autosave01.sav
Right click on one of them and go to properties.
Click on 'read-only' then click OK.
Viola. Tell me if it works for you, it works for me, I think there might be a tiny bit of stutter still as it attempts to do it, but its nothing like it was.
Give it a try.