First, please use the FSUIPC7 / MSFS support sub-forum for all issues/questions with FSUIPC7 and not the main support forum which is for all other versions/products. I have moved your post.
Yes.
The main cause of such stuttering is excessive logging by MSFS. Can you check the MSFS logging console to see what messages are logged, and if they are being logged at a very fast rate (you will need to activate Developer mode in MSFS to see the logging console).
Does this occur with all aircraft or only a selection (please try both simpler/ GA aircraft and more complex ones)? Excessive logging can be caused by FSUIPC requesting variables from the new fuel or electrical system in an aircraft that does not use them. FSUIPC does not do this by default, and so if this is the cause it is due to a simvar being requested via the myOffsets.txt file. So, if using that file, check to see if it has any such simvars added and if so you should only use that file when flying an aircraft that uses the new systems.
Please attach your FSUIPC7.log and FSUIPC7.ini files, as well as your FSUIPC_WASM.log file. Please only attach files once FSUIPC7 has exited, and only attach the WASM log file after exiting MSFS.