If you are Royal TSX customer and have no intention of purchasing a Rebex product, please report issues such as this to Royal TSX customer support (who can then get in touch with us according to the terms of their support contract). Direct provision of support services by Rebex to Royal TSX customers is not part of our support contract with Royal TSX developer.
Regardless, we can offer some advice for Rebex customers who stumble upon this issue.
- Mono seems to be slower than .NET Framework in most scenarios, and old versions of Mono are slower than new versions. Make sure you use a recent version of Mono. However, when using Rebex libraries on Mono/macOS, measured transfer speeds are usually lower than on .NET/Windows.
- On Mono/macOS, some symmetric ciphers are implemented in managed code. On Windows, much faster native implementations provided by Windows CryptoAPI or CNG API are used instead. Disabling AES/GCM ciphers on non-Windows platforms often improves transfer speeds.
- Setting
Ftp.Settings.UseLargeBufferstotruemight improve transfer speeds as well.