Would upgrading to SSD solve my performance issues?
A RAM upgrade is inexpensive (~$70) compared to an SSD (~$1 per GB e.g. $250 for a 240GB) and based on your pagefile usage and available RAM I would start there.  That being said, an SSD is a massive performance upgrade and worth every dollar in my opinion.  I won't use a machine without an SSD anymore.

Links to: RAM and SSD.

Could you provide some more details as to what specifically is slow?