Just updated to Yosemite on my iMac 2011 and it is completely unusable with my mouse. I use a Razer Mamba 2012 mouse on it's highest sensitivity which worked perfectly under 10.9
After upgrading it's immediately apparent something with the mouse acceleration has changed in this version as the cursor jumps all over the place making it near enough impossible to predict where it will land!
Changing the sensitivity on the mouse seems to help but this is not a solution, now takes me at least 4 movements picking the mouse up to clear my 3 monitors. Using another mouse is not an option, this is the only mouse I have found which doesn't set my RSI and CTS conditions off when configured correctly.
As I have had to pick the mouse up to move around the screen and make no end of unnecessary movements just searching for a solution to this in the last hour I can already feel my wrist hurting.
Anyone got any tips for resolving this? A few suggestions seem to be to pay for 3rd party software? Must be a quick easy command line option I can change?

After upgrading it's immediately apparent something with the mouse acceleration has changed in this version as the cursor jumps all over the place making it near enough impossible to predict where it will land!
Changing the sensitivity on the mouse seems to help but this is not a solution, now takes me at least 4 movements picking the mouse up to clear my 3 monitors. Using another mouse is not an option, this is the only mouse I have found which doesn't set my RSI and CTS conditions off when configured correctly.
As I have had to pick the mouse up to move around the screen and make no end of unnecessary movements just searching for a solution to this in the last hour I can already feel my wrist hurting.
Anyone got any tips for resolving this? A few suggestions seem to be to pay for 3rd party software? Must be a quick easy command line option I can change?