2012 MBP

I have a mid 2012 MacBook pro running 15.0 via oclp Computer had major issues so i ported my ram, hard disk and motherboard onto a donor MBP( same mid 2012) however now laptop is super slow and laggy Im thinking of updating to 15.3.2, however, i do not know if this will solve my issue What do you guys think?

Author: @Informal_Stretch9893