Hi,
I had the same problem with the autosave lag. It happened to me because I changed the setting "uset g_save_format" from 1 to 3 to sync my jobs with www.ets2sync.com/.
The solution in my case was:
Go to your documents folder
Open Euro Truck Simulator 2 folder
Open config.cfg with the editor
Change the line
uset g_save_format "3"
to
uset g_save_format "1"
Now save your document and try playing again, lag should be banned