I have a Late 2015 iMac which has a 2.7 GHz Intel Core i5 processor and 8 GB of memory.
I also have a Mid 2012 MacBook Air which has a 1.8 GHz Intel Core i5 processor and 4 GB of memory.
The iMac uses a Apple HDD in contrast to the MacBook Air's Apple SSD.
However, it seems like the iMac is running much slower than MacBook Air from the day it was bought. It would occasionally show the spinning wheel, when opening files and it would take an average of 20 seconds to open applications.
Q1: Is the HDD/SSD the main cause of this? Since all the other configurations are better than MacBook Air.
Q2: Would its speed improve if I switch the HDD to a SSD?