DC DC converter simulation time slow in lt spice
The error in the circuit is quite obvious once you see it.
The values of C1, C2, C5, C8 and C9 are 0.1 which means 0.1 F.
A huge bootstrap cap (C2), a shorted sensing circuit (C5), a very slow soft-start (C1) .... numerous reasons why the simulation is slow and gives weird results.
The intended values probably are 0.1uF.