You’ve pretty much got the same processor as me. Sadly its just an older processor now and it does struggle with the CPU load the sim puts on it. The larger aircraft like the A320 are particularly big CPU hitters. I’m eyeing up a new processor and motherboard at some point this year. Its the only solution as far as I can see.
By the way you can get better FPS in the exterior camera view by turning off the display information. That might help you a little.