i have the same problem with software store , takes AGES to load , everytime.
to the point i dont go there anymore , if i want something i search and install it through terminal .
CPU: Celeron T3500 (2) @ 2.094GHz
Memory: 1113MiB / 3840MiB
Zorin OS 17.1
6.5.0-41-generic
Xfce (lite)