I cannot confirm this. I will add some benchmark results later.
What is your Cryptomator version and what is your Dokany version?
Since version 1.4.12 you have additional mount parameters with Dokany. There you can increase the timeout parameter and the number of threads to handle file system operations. I suggest to increase these parameters, e.g. --timeout 30000 --thread-count 50. Does this increase the performance?