I believe a bit of that slowness has to do with the Gnome 46 or Gnome 47 desktop environment that Cinnamon is built from.
Gnome desktop environment is demanding on system resources and if them system resources ain't available it will load the processor and give slow overall performance.
Xfce and Mate desktop environments aren't very resource demanding and are a better choice for older not so powerful computers.
I know it's hard to believe that an old Laptop could run like new but it's just happened to me.
I installed Mint XFCE on my old Laptop and it now runs like lighting...type in my password..hit Enter...5 seconds to the Desktop...my Tower running Mint Cinnamon 22.1 takes 3 to 4 seconds and that has an i5 12th gen CPU with 6 cores and 12 threads which is only 2 years old.

