hey my zorin is giving very much lag 2 months before it was buttery smooth now it has changed drastically in a month
Can you remember if you installed some specific apps in that period that might running heavily in the background?
i installed many files software some of android , some of windows ,some of linux many things i have installed but i think it can because of dual booting some days before i was trying to setup dual booting but i failed after that when i evertime start my laptop it start with that dual boot software so i used my mind do played with bootloader and setup zorin again in starting
i think it maybe because of that
OKay, lets try with analyzing your startup, it may also give an insight what's running in the background that takes resources.
systemd-analyze time systemd-analyze blame