Saving to network drive super slow

Mocha Pro 2.6.0 - XP64
Working on a fair sized roto job, Mocha would take over a minute to autosave a function file to a network drive, which slows things down considerably if you want to have constant autosaves to prevent problems.
The .mocha file is 13MB – and saving the same file to the local disk takes 2-3 seconds instead of over 1 minute! It is not the network speed, as we can read/write large files over the network quickly. Is Mocha appending each line of the function file to save the file - causing many many I/Os?

Can you send me your file? That doesn’t sound like intended behavior.