We have identified an issue that somehow some users WASM is not compiling and is in DEBUG.
This is not intended, and we have sent a message to MS/Asobo.
Some people have found some workarounds, but this is still under investigation.
Like the PMDG, the A310 is a WASM aircraft, so should take at least some time to load in. If you are loading in <60 seconds something has gone wrong and could explain your poor FPS.
This is an ongoing investigation, so we request your patience, and be sure that we will get this resolved for you as soon as we can.
Those with good FPS and normal operation, please guide anyone struggling here to this note / our discord thread.
Many thanks.