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LM5122: LTSpice takes a long time to calculate results

Part Number: LM5122
Other Parts Discussed in Thread: TINA-TI,

 I am trying to measure the conducted noise tests of my boost DC-DC converter. I started the simulation to check whether I did everything correctly, but LTSpice takes it a very long time. I do this in the same simulation in TINA-TI and he calculated everything for me in 10 minutes (take a look at the screen). And what are these strange pulsations on LO and HO (attached a screen) in LTSpice. Maybe I'm using the wrong calculation method in LTSpice. Vin=12V Vout=24V Switching frequency 800 kHz