200-300 fps Loading Up the Sim for Flight

Normally when loading up FS2020 for a flight my “developer” FPS runs anywhere from 40- 70 FPS. On one occasion the other night my FPS during the same load was running upwards of 750 fps! It did the same thing again today. I was amazed watching the frame counter screaming, all in the green! Even the FPS at my usual intl. airport, and flying in severe storms were twice as much as I normally see. I checked my wifi and it was around 20mb… normal! Anyone know what might have caused this? Intriguing to say the least.

Ryzen 5 2600, RX580 w/4mb, 24gb ram, 500mb dedicated SSD gen 3x4 M.2