I disagree. Upgrading to an SSD prior to installing the proper amount of RAM would reduce the life of the SSD, and still be quite slow. First, with inadequate RAM, the SSD will be utilized as virtual memory, offsetting the lack of physical RAM. By doing this, the computer will write tasks that are normally written to RAM, to the SSD. Because SSDs have only a finite amount of writes available to each transistor, you'll effectively shorten its lifetime, and increase the risk of data loss. Additionally, even fast SSDs pale in comparison to the speed of RAM ~500MB/s in SSDs vs. ~23 GB/s in RAM (@1333 MHz). Therefore, the best solution would be to install the appropriate amount of RAM first, followed by an SSD upgrade. Once the proper amount of RAM is installed, an SSD will truly shine.
thanks for the info, obviously I never noticed this because I had already upgraded to 16GB of RAM a year before the SSD upgrade, all I can say is even a 16GB early 2011 MBP can be slow and beach balled to death with a slow HDD