Hi,
I dont think that this error is the cause of the slow performance.
For the slow performance please check what is the size of the doc and MAXdb server performance and the settings. Can you please explain more on where it is slow.
Please check the below note for the error.
1638056 - Error in program RSCMSTH1
1669167 - Backend path for test files changes while executing program
Thanks
RishI Abrol