I'm looking for some advice about upgrading a Macbook Air to Mavericks. It is a mid 2011 BMA that is still running Lion. It has the 1.6 Intel i5 with only 4 GB of ram. I know that it is capable of running Mavericks, but I'm worried there may be some issues, especially if it will be slow due to only having 4GBs. Has anyone with this or a similar model upgraded to Mavericks? Anyone have problems, or is there no difference in performance? Thanks for the help.