cvs afaik, ssh ssh ( , ). .
edit: cvs -z ( ssh -C)
Encryption is not something useful to improve performance. Using ssh will also do encryption, but this is not for performance, but for security.
Wherever the repository is located, disk access for the repository and temporary files will affect performance. This is combined with memory. When checking, cvs will build what it sends to the client (as temporary files). This caused a lot of malfunctions and, in some cases, the use of memory (esp when working with large binary files).
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