I've been researching this constant crashing horse shit and it appears that Cheetah Speed is certainly causing issues.
In fact, crashing and not saving has gotten so bad that Amazon has pulled SimCity from their Digital Download List until it's fixed: http://consumerist.com/2013/03/07/amazon-pulls-simcity-5-downloads-amid-furor-over-constant-crashing-slow-servers/
Apparently EA is trying to get more Servers up and a few hotfixes on the way but either way it sounds like the road ahead will remain a bit bumpy at least over the short term.
In fact, crashing and not saving has gotten so bad that Amazon has pulled SimCity from their Digital Download List until it's fixed: http://consumerist.com/2013/03/07/amazon-pulls-simcity-5-downloads-amid-furor-over-constant-crashing-slow-servers/
Apparently EA is trying to get more Servers up and a few hotfixes on the way but either way it sounds like the road ahead will remain a bit bumpy at least over the short term.