Hi,
I also get very very low performance with the A310.
My fps locked to 40 fps and for exapmle, In KJFK I get 13-18 fps with a310 whereas I get 33-35 fps with pmdg 737 and fbw a320. Simply it is not flyable for me and since I really like the a310, this is very annoying for me.
rtx3070
i7 9700k
32 gb ram
1tb m2 ssd