Hi, I have a 2009 Macbook with 8GB Ram and a Sata II SSD. The unit has been ticking along nicely on Mountain Lion (10.8.5) and I have been very apprehensive of updating to a newer OS. However I am now starting to receive notifications advising me that Firefox & Google Chrome are no longer supported. Is it worth me considering an OS upgrade at this point? Anyone know what sort of performance hit I'm likely to take with Mavericks or El Captain? I know Mavericks introduces a whole new dynamic in terms of memory management, however would this actually introduce a performance increase for me (as I'm not exactly hurting for memory), or would I be more likely to experience an all-round slower system? Thanks in advance!