Strange fps issue Dreamliner

So this morning I flew from SEQM to EHAM in the Dreamliner using the Heavy mod.

No issues on departure and as usual i accelerated to x4 sim speed shortly after departure until before TOD. I returned to regular sim speed about 40nm from TOD. Still running fine. Shortly after beginning descent the sim starts to seriously stutter. It improves a little half way down but still not great. Then just as I start descending on the glideslope for Rwy 36R all of a sudden the sim goes back to super smooth!!

Just wondering if anyone else has had anything like this and what the cause is (mod itself or other bug)

Topic moved into Community Support. The Bug Reporting category is for confirmed bugs using the provided template that can be replicated by others. :+1: