Ha!
I have the very same issue (just have not tried what @aadi_sim did after landing).
Long haul - KJFL-OTHH (both Ini), A350-1000, between TOC and TOD 4x sim rate. After un-pausing at TOD significant FPS loss, normally, even on JFK I have about 50-60fps on High settings. in the approach all the way tp the gate 15-20 FPS 😞
Specs:
Ryzen 7 7800X3D
RX 7800XT
32GB RAM
Edit:
I have found that topic, so to be clear - I got A350 this weekend on sale. It was my 3rd flight, others were DXB-DMM and the some circuits around SEA.
BTW - the fact that the below topic had been closed without any comment/answer is does not send optimistic message to be honest.